Apply Code Coverage Badge

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,6 +1,6 @@
 ---
 name: Bug report
-about: For reporting bugs in go-micro
+about: For reporting bugs in micro
 title: "[BUG]"
 labels: ''
 assignees: ''
@@ -16,9 +16,3 @@ assignees: ''
 **How to reproduce the bug:**
 
 If possible, please include a minimal code snippet here.
-
-**Environment:**
-Go Version: please paste `go version` output here
-```
-please paste `go env` output here
-```

.github/ISSUE_TEMPLATE/feature-request---enhancement.md

@@ -1,6 +1,6 @@
 ---
 name: Feature request / Enhancement
-about: If you have a need not served by go-micro
+about: If you have a need not served by micro
 title: "[FEATURE]"
 labels: ''
 assignees: ''
@@ -14,4 +14,4 @@ A clear and concise description of what the problem is. Ex. I'm always frustrate
 A clear and concise description of what you want to happen.
 
 **Additional context**
-Add any other context or screenshots about the feature request here.
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

@@ -1,14 +1,8 @@
 ---
 name: Question
-about: Ask a question about go-micro
+about: Ask a question about micro
 title: ''
 labels: ''
 assignees: ''
 
----
-
-Before asking, please check if your question has already been answered: 
-
-1. Check the documentation - https://micro.mu/docs/
-2. Check the examples and plugins - https://github.com/micro/examples & https://github.com/micro/go-plugins
-3. Search existing issues
+---

.github/autoapprove.yml

@@ -0,0 +1,28 @@
+name: "autoapprove"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+  workflow_run:
+    workflows: ["prbuild"]
+    types:
+      - completed
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  autoapprove:
+    runs-on: ubuntu-latest
+    steps:
+      - name: approve
+        run: [ "curl -o tea https://dl.gitea.com/tea/main/tea-main-linux-amd64",
+               "chmod +x ./tea",
+               "./tea login add --name unistack --token ${{ secrets.GITHUB_TOKEN }} --url https://git.unistack.org",
+               "./tea pr --repo ${{ github.event.repository.name }}"
+        ]
+        if: github.actor == 'vtolstov'
+        id: approve
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.github/dependabot.yml

@@ -1,19 +0,0 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
-# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
-
-version: 2
-updates:
-
-  # Maintain dependencies for GitHub Actions
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "daily"
-
-  # Maintain dependencies for Golang
-  - package-ecosystem: "gomod"
-    directory: "/"
-    schedule:
-      interval: "daily"

.github/workflows/autoapprove.yml

@@ -1,20 +0,0 @@
-name: "autoapprove"
-
-on:
-  pull_request_target:
-    types: [assigned, opened, synchronize, reopened]
-
-permissions:
-  pull-requests: write
-  contents: write
-
-jobs:
-  autoapprove:
-    runs-on: ubuntu-latest
-    steps:
-      - name: approve
-        uses: hmarr/auto-approve-action@v2
-        if: github.actor == 'vtolstov' || github.actor == 'dependabot[bot]'
-        id: approve
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/automerge.yml

@@ -1,21 +0,0 @@
-name: "automerge"
-
-on:
-  pull_request_target:
-    types: [assigned, opened, synchronize, reopened]
-
-permissions:
-  pull-requests: write
-  contents: write
-
-jobs:
-  automerge:
-    runs-on: ubuntu-latest
-    if: github.actor == 'vtolstov'
-    steps:
-      - name: merge
-        id: merge
-        run: gh pr merge --auto --merge "$PR_URL"
-        env:
-          PR_URL: ${{github.event.pull_request.html_url}}
-          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github/workflows/build.yml

@@ -1,47 +0,0 @@
-name: build
-on:
- push:
-    branches:
-    - master
-    - v3
-jobs:
-  test:
-    name: test
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup
-      uses: actions/setup-go@v3
-      with:
-        go-version: 1.17
-    - name: checkout
-      uses: actions/checkout@v3
-    - name: cache
-      uses: actions/cache@v3
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: ${{ runner.os }}-go-
-    - name: deps
-      run: go get -v -t -d ./...
-    - name: test
-      env:
-        INTEGRATION_TESTS: yes
-      run: go test -mod readonly -v ./...
-  lint:
-    name: lint
-    runs-on: ubuntu-latest
-    steps:
-      - name: checkout
-        uses: actions/checkout@v3
-      - name: lint
-        uses: golangci/golangci-lint-action@v3.3.1
-        continue-on-error: true
-        with:
-          # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
-          version: v1.30
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-          # Optional: golangci-lint command line arguments.
-          # args: --issues-exit-code=0
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true

.github/workflows/codeql-analysis.yml

@@ -1,78 +0,0 @@
-# For most projects, this workflow file will not need changing; you simply need
-# to commit it to your repository.
-#
-# You may wish to alter this file to override the set of languages analyzed,
-# or to provide custom queries or build logic.
-#
-# ******** NOTE ********
-# We have attempted to detect the languages in your repository. Please check
-# the `language` matrix defined below to confirm you have the correct set of
-# supported CodeQL languages.
-#
-name: "codeql"
-
-on:
-  workflow_run:
-    workflows: ["prbuild"]
-    types:
-      - completed
-  push:
-    branches: [ master, v3 ]
-  pull_request:
-    # The branches below must be a subset of the branches above
-    branches: [ master, v3 ]
-  schedule:
-    - cron: '34 1 * * 0'
-
-jobs:
-  analyze:
-    name: analyze
-    runs-on: ubuntu-latest
-    permissions:
-      actions: read
-      contents: read
-      security-events: write
-
-    strategy:
-      fail-fast: false
-      matrix:
-        language: [ 'go' ]
-        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
-        # Learn more:
-        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
-
-    steps:
-    - name: checkout
-      uses: actions/checkout@v3
-    - name: setup
-      uses: actions/setup-go@v3
-      with:
-        go-version: 1.17
-    # Initializes the CodeQL tools for scanning.
-    - name: init
-      uses: github/codeql-action/init@v2
-      with:
-        languages: ${{ matrix.language }}
-        # If you wish to specify custom queries, you can do so here or in a config file.
-        # By default, queries listed here will override any specified in a config file.
-        # Prefix the list here with "+" to use these queries and those in the config file.
-        # queries: ./path/to/local/query, your-org/your-repo/queries@main
-
-    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
-    # If this step fails, then you should remove it and run the build manually (see below)
-    - name: autobuild
-      uses: github/codeql-action/autobuild@v2
-
-    # ℹ️ Command-line programs to run using the OS shell.
-    # 📚 https://git.io/JvXDl
-
-    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
-    #    and modify them (or add more) to build your code if your project
-    #    uses a compiled language
-
-    #- run: |
-    #   make bootstrap
-    #   make release
-
-    - name: analyze
-      uses: github/codeql-action/analyze@v2

.github/workflows/dependabot-automerge.yml

@@ -1,27 +0,0 @@
-name: "dependabot-automerge"
-
-on:
-  pull_request_target:
-    types: [assigned, opened, synchronize, reopened]
-
-permissions:
-  pull-requests: write
-  contents: write
-
-jobs:
-  automerge:
-    runs-on: ubuntu-latest
-    if: github.actor == 'dependabot[bot]'
-    steps:
-      - name: metadata
-        id: metadata
-        uses: dependabot/fetch-metadata@v1.3.5
-        with:
-          github-token: "${{ secrets.TOKEN }}"
-      - name: merge
-        id: merge
-        if: ${{contains(steps.metadata.outputs.dependency-names, 'go.unistack.org')}}
-        run: gh pr merge --auto --merge "$PR_URL"
-        env:
-          PR_URL: ${{github.event.pull_request.html_url}}
-          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github/workflows/job_coverage.yml

@@ -0,0 +1,53 @@
+name: coverage
+
+on:
+  push:
+    branches: [ main, v3, v4 ]
+    paths-ignore:
+      - '.github/**'
+      - '.gitea/**'
+  pull_request:
+    branches: [ main, v3, v4 ]
+
+jobs:
+
+  build:
+    if: github.server_url != 'https://github.com'
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+
+    - name: test coverage
+      run: |
+        go test -v -cover ./... -covermode=count -coverprofile coverage.out -coverpkg ./...
+        go tool cover -func coverage.out -o coverage.out
+
+    - name: coverage badge
+      uses: tj-actions/coverage-badge-go@v2
+      with:
+        green: 80
+        filename: coverage.out
+
+    - uses: stefanzweifel/git-auto-commit-action@v4
+      name: autocommit
+      with:
+        commit_message: Apply Code Coverage Badge
+        skip_fetch: false
+        skip_checkout: false
+        file_pattern: ./README.md
+
+    - name: push
+      if: steps.auto-commit-action.outputs.changes_detected == 'true'
+      uses: ad-m/github-push-action@master
+      with:
+        github_token: ${{ github.token }}
+        branch: ${{ github.ref }}

.github/workflows/job_lint.yml

@@ -0,0 +1,29 @@
+name: lint
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches: [ master, v3, v4 ]
+    paths-ignore:
+      - '.github/**'
+      - '.gitea/**'
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+    - name: setup deps
+      run: go get -v ./...
+    - name: run lint
+      uses: golangci/golangci-lint-action@v6
+      with:
+        version: 'latest'

.github/workflows/job_sync.yml

@@ -0,0 +1,94 @@
+name: sync
+
+on:
+  schedule:
+    - cron: '*/5 * * * *'
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  sync:
+    if: github.server_url != 'https://github.com'
+    runs-on: ubuntu-latest
+    steps:
+    - name: init
+      run: |
+        git config --global user.email "vtolstov <vtolstov@users.noreply.github.com>"
+        git config --global user.name "github-actions[bot]"
+        echo "machine git.unistack.org login vtolstov password ${{ secrets.TOKEN_GITEA }}" >> /root/.netrc
+        echo "machine github.com login vtolstov password ${{ secrets.TOKEN_GITHUB }}" >> /root/.netrc
+
+    - name: check master
+      id: check_master
+      run: |
+        src_hash=$(git ls-remote https://github.com/${GITHUB_REPOSITORY} refs/heads/master | cut -f1)
+        dst_hash=$(git ls-remote ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} refs/heads/master | cut -f1)
+        echo "src_hash=$src_hash"
+        echo "dst_hash=$dst_hash"
+        if [ "$src_hash" != "$dst_hash" ]; then
+          echo "sync_needed=true" >> $GITHUB_OUTPUT
+        else
+          echo "sync_needed=false" >> $GITHUB_OUTPUT
+        fi
+
+    - name: sync master
+      if: steps.check_master.outputs.sync_needed == 'true'
+      run: |
+        git clone --filter=blob:none --filter=tree:0 --branch master --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
+        cd repo
+        git remote add --no-tags --fetch --track master upstream https://github.com/${GITHUB_REPOSITORY}
+        git pull --rebase upstream master
+        git push upstream master --progress
+        git push origin master --progress
+        cd ../
+        rm -rf repo
+
+    - name: check v3
+      id: check_v3
+      run: |
+        src_hash=$(git ls-remote https://github.com/${GITHUB_REPOSITORY} refs/heads/v3 | cut -f1)
+        dst_hash=$(git ls-remote ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} refs/heads/v3 | cut -f1)
+        echo "src_hash=$src_hash"
+        echo "dst_hash=$dst_hash"
+        if [ "$src_hash" != "$dst_hash" ]; then
+          echo "sync_needed=true" >> $GITHUB_OUTPUT
+        else
+          echo "sync_needed=false" >> $GITHUB_OUTPUT
+        fi
+
+    - name: sync v3
+      if: steps.check_v3.outputs.sync_needed == 'true'
+      run: |
+        git clone --filter=blob:none --filter=tree:0 --branch v3 --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
+        cd repo
+        git remote add --no-tags --fetch --track v3 upstream https://github.com/${GITHUB_REPOSITORY}
+        git pull --rebase upstream v3
+        git push upstream v3 --progress
+        git push origin v3 --progress
+        cd ../
+        rm -rf repo
+
+    - name: check v4
+      id: check_v4
+      run: |
+        src_hash=$(git ls-remote https://github.com/${GITHUB_REPOSITORY} refs/heads/v4 | cut -f1)
+        dst_hash=$(git ls-remote ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} refs/heads/v4 | cut -f1)
+        echo "src_hash=$src_hash"
+        echo "dst_hash=$dst_hash"
+        if [ "$src_hash" != "$dst_hash" ]; then
+          echo "sync_needed=true" >> $GITHUB_OUTPUT
+        else
+          echo "sync_needed=false" >> $GITHUB_OUTPUT
+        fi
+
+    - name: sync v4
+      if: steps.check_v4.outputs.sync_needed == 'true'
+      run: |
+        git clone --filter=blob:none --filter=tree:0 --branch v4 --single-branch ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY} repo
+        cd repo
+        git remote add --no-tags --fetch --track v4 upstream https://github.com/${GITHUB_REPOSITORY}
+        git pull --rebase upstream v4
+        git push upstream v4 --progress
+        git push origin v4 --progress
+        cd ../
+        rm -rf repo

.github/workflows/job_test.yml

@@ -0,0 +1,31 @@
+name: test
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches: [ master, v3, v4 ]
+  push:
+    branches: [ master, v3, v4 ]
+    paths-ignore:
+      - '.github/**'
+      - '.gitea/**'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+    - name: setup deps
+      run: go get -v ./...
+    - name: run test
+      env:
+        INTEGRATION_TESTS: yes
+      run: go test -mod readonly -v ./...

.github/workflows/job_tests.yml

@@ -0,0 +1,50 @@
+name: test
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+    branches: [ master, v3, v4 ]
+  push:
+    branches: [ master, v3, v4 ]
+    paths-ignore:
+      - '.github/**'
+      - '.gitea/**'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        filter: 'blob:none'
+    - name: checkout tests
+      uses: actions/checkout@v4
+      with:
+        ref: master
+        filter: 'blob:none'
+        repository: unistack-org/micro-tests
+        path: micro-tests
+    - name: setup go
+      uses: actions/setup-go@v5
+      with:
+        cache-dependency-path: "**/*.sum"
+        go-version: 'stable'
+    - name: setup go work
+      env:
+        GOWORK: ${{ github.workspace }}/go.work
+      run: |
+        go work init
+        go work use .
+        go work use micro-tests
+    - name: setup deps
+      env:
+        GOWORK: ${{ github.workspace }}/go.work
+      run: go get -v ./...
+    - name: run tests
+      env:
+        INTEGRATION_TESTS: yes
+        GOWORK: ${{ github.workspace }}/go.work
+      run: |
+        cd micro-tests
+        go test -mod readonly -v ./... || true

.github/workflows/pr.yml

@@ -1,47 +0,0 @@
-name: prbuild
-on:
-  pull_request:
-    branches:
-    - master
-    - v3
-jobs:
-  test:
-    name: test
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup
-      uses: actions/setup-go@v3
-      with:
-        go-version: 1.17
-    - name: checkout
-      uses: actions/checkout@v3
-    - name: cache
-      uses: actions/cache@v3
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: ${{ runner.os }}-go-
-    - name: deps
-      run: go get -v -t -d ./...
-    - name: test
-      env:
-        INTEGRATION_TESTS: yes
-      run: go test -mod readonly -v ./...
-  lint:
-    name: lint
-    runs-on: ubuntu-latest
-    steps:
-      - name: checkout
-        uses: actions/checkout@v3
-      - name: lint
-        uses: golangci/golangci-lint-action@v3.3.1
-        continue-on-error: true
-        with:
-          # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
-          version: v1.30
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-          # Optional: golangci-lint command line arguments.
-          # args: --issues-exit-code=0
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true

.gitignore

@@ -0,0 +1,39 @@
+# Develop tools
+/.vscode/
+/.idea/
+.idea
+.vscode
+
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Folders
+_obj
+_test
+_build
+.DS_Store
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# vim temp files
+*~
+*.swp
+*.swo

.golangci.yml

@@ -1,44 +1,5 @@
 run:
-  concurrency: 4
-  deadline: 5m
+  concurrency: 8
+  timeout: 5m
   issues-exit-code: 1
   tests: true
-
-linters-settings:
-  govet:
-    check-shadowing: true
-    enable:
-      - fieldalignment
-
-linters:
-  enable:
-    - govet
-    - deadcode
-    - errcheck
-    - govet
-    - ineffassign
-    - staticcheck
-    - structcheck
-    - typecheck
-    - unused
-    - varcheck
-    - bodyclose
-    - gci
-    - goconst
-    - gocritic
-    - gosimple
-    - gofmt
-    - gofumpt
-    - goimports
-    - golint
-    - gosec
-    - makezero
-    - misspell
-    - nakedret
-    - nestif
-    - nilerr
-    - noctx
-    - prealloc
-    - unconvert
-    - unparam
-  disable-all: false

README.md

@@ -1,18 +1,26 @@
 # HTTP Client
+![Coverage](https://img.shields.io/badge/Coverage-42.7%25-yellow)
 
-This plugin is a http client for micro.
+This plugin is an HTTP client for [Micro](https://pkg.go.dev/go.unistack.org/micro/v4).
+It implements the [micro.Client](https://pkg.go.dev/go.unistack.org/micro/v4/client#Client) interface.
 
 ## Overview
 
-The http client wraps `net/http` to provide a robust micro client with service discovery, load balancing and streaming. 
-It complies with the [micro.Client](https://godoc.org/go.unistack.org/micro-client-http/v3#Client) interface.
+The HTTP client wraps `net/http` to provide a robust client with service discovery, load balancing and 
+implements HTTP rules defined in the [google/api/http.proto](https://github.com/googleapis/googleapis/blob/master/google/api/http.proto) specification.
+
+## Limitations
+
+* Streaming is not yet implemented.
+* Only protobuf-generated messages are supported.
 
 ## Usage
 
-### Use directly
-
 ```go
-import "go.unistack.org/micro-client-http/v3"
+import (
+    "go.unistack.org/micro/v4"
+    http "go.unistack.org/micro-client-http/v4"
+)
 
 service := micro.NewService(
 	micro.Name("my.service"),
@@ -20,43 +28,127 @@ service := micro.NewService(
 )
 ```
 
-### Call Service
+### Simple call
 
-Assuming you have a http service "my.service" with path "/foo/bar"
 ```go
-// new client
-client := http.NewClient()
+import (
+    "go.unistack.org/micro/v4/client"
+    http "go.unistack.org/micro-client-http/v4"
+    jsoncodec "go.unistack.org/micro-codec-json/v4"
+)
 
-// create request/response
-request := client.NewRequest("my.service", "/foo/bar", protoRequest{})
-response := new(protoResponse)
+c := http.NewClient(
+    client.Codec("application/json", jsoncodec.NewCodec()),
+)
 
-// call service
-err := client.Call(context.TODO(), request, response)
+req := c.NewRequest(
+    "user-service",
+    "/user/{user_id}/order/{order_id}",
+    &protoReq{UserId: "123", OrderId: 456},
+)
+rsp := new(protoRsp)
+
+err := c.Call(
+    ctx,
+    req,
+    rsp,
+    client.WithAddress("example.com"),
+)
 ```
 
-or you can call any rest api or site and unmarshal to response struct
+### Call with specific options
+
 ```go
-// new client
-client := client.NewClientCallOptions(http.NewClient(), http.Address("https://api.github.com"))
+import (
+    "go.unistack.org/micro/v4/client"
+    http "go.unistack.org/micro-client-http/v4"
+)
 
-req := client.NewRequest("github", "/users/vtolstov", nil)
-rsp := make(map[string]interface{})
-
-err := c.Call(context.TODO(), req, &rsp, mhttp.Method(http.MethodGet)) 
+err := c.Call(
+    ctx,
+    req,
+    rsp,
+    client.WithAddress("example.com"),
+    http.Method("POST"),
+    http.Path("/user/{user_id}/order/{order_id}"),
+    http.Body("*"), // <- use all fields from the proto request as HTTP request body or specify a single field name to use only that field (see Google API HTTP spec: google/api/http.proto)
+)
 ```
 
-Look at http_test.go for detailed use.
+### Call with request headers
 
-### Encoding
-
-Default protobuf with content-type application/proto
 ```go
-client.NewRequest("service", "/path", protoRequest{})
+import (
+    "go.unistack.org/micro/v4/metadata"
+    http "go.unistack.org/micro-client-http/v4"
+)
+
+ctx := metadata.NewOutgoingContext(ctx, metadata.Pairs(
+    "Authorization", "Bearer token",
+    "My-Header", "My-Header-Value",
+))
+
+err := c.Call(
+    ctx,
+    req,
+    rsp,
+    http.Header("Authorization", "true", "My-Header", "false"), // <- call option that declares required/optional headers
+)
 ```
 
-Json with content-type application/json
+### Call with response headers
+
 ```go
-client.NewJsonRequest("service", "/path", jsonRequest{})
+import (
+    "go.unistack.org/micro/v4/metadata"
+    http "go.unistack.org/micro-client-http/v4"
+)
+
+respMetadata := metadata.Metadata{}
+
+err := c.Call(
+    ctx,
+    req,
+    rsp,
+    client.WithResponseMetadata(&respMetadata), // <- metadata with response headers
+)
 ```
 
+### Call with cookies
+
+```go
+import (
+    "go.unistack.org/micro/v4/metadata"
+    http "go.unistack.org/micro-client-http/v4"
+)
+
+ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(
+    "Cookie", "session_id=abc123; theme=dark",
+))
+
+err := c.Call(
+    ctx,
+    req,
+    rsp,
+    http.Cookie("session_id", "true", "theme", "false"), // <- call option that declares required/optional cookies
+)
+```
+
+### Call with error mapping
+
+```go
+import (
+    http "go.unistack.org/micro-client-http/v4"
+    jsoncodec "go.unistack.org/micro-codec-json/v4"
+)
+
+err := c.Call(
+    ctx,
+    req,
+    rsp,
+    http.ErrorMap(map[string]any{
+        "default": &protoDefaultError{}, // <- default case
+        "403":     &protoSpecialError{}, // <- key is the HTTP status code that is mapped to this error
+    }),
+)
+```

builder/body.go

@@ -0,0 +1,116 @@
+package builder
+
+import (
+	"fmt"
+
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+func buildSingleFieldBody(msg proto.Message, fieldName string) (proto.Message, error) {
+	msgReflect := msg.ProtoReflect()
+
+	fd, found := findFieldByName(msgReflect, fieldName)
+	if !found || fd == nil {
+		return nil, fmt.Errorf("field %s not found", fieldName)
+	}
+	if !msgReflect.Has(fd) {
+		return nil, fmt.Errorf("field %s is not set", fieldName)
+	}
+
+	val := msgReflect.Get(fd)
+
+	if fd.Kind() == protoreflect.MessageKind {
+		return val.Message().Interface(), nil
+	}
+
+	newMsg := proto.Clone(msg)
+	newMsgReflect := newMsg.ProtoReflect()
+	newMsgReflect.Range(func(f protoreflect.FieldDescriptor, _ protoreflect.Value) bool {
+		if f != fd {
+			newMsgReflect.Clear(f)
+		}
+		return true
+	})
+
+	return newMsg, nil
+}
+
+func buildFullBody(msg proto.Message, usedFieldsPath *usedFields) (proto.Message, error) {
+	var (
+		msgReflect    = msg.ProtoReflect()
+		newMsg        = msgReflect.New().Interface()
+		newMsgReflect = newMsg.ProtoReflect()
+	)
+
+	fields := msgReflect.Descriptor().Fields()
+	for i := 0; i < fields.Len(); i++ {
+		fd := fields.Get(i)
+		fieldName := fd.JSONName()
+
+		if usedFieldsPath.hasTopLevelKey(fieldName) {
+			continue
+		}
+
+		val := msgReflect.Get(fd)
+		if !val.IsValid() {
+			continue
+		}
+
+		// Note: order of the cases is important!
+		switch {
+		case fd.IsList():
+			list := val.List()
+			newList := newMsgReflect.Mutable(fd).List()
+
+			if fd.Kind() == protoreflect.MessageKind {
+				for j := 0; j < list.Len(); j++ {
+					elem, err := buildFullBody(list.Get(j).Message().Interface(), usedFieldsPath)
+					if err != nil {
+						return nil, fmt.Errorf("recursive build full body: %w", err)
+					}
+					newList.Append(protoreflect.ValueOfMessage(elem.ProtoReflect()))
+				}
+			} else {
+				for j := 0; j < list.Len(); j++ {
+					newList.Append(list.Get(j))
+				}
+			}
+
+		case fd.IsMap():
+			var (
+				m        = val.Map()
+				newMap   = newMsgReflect.Mutable(fd).Map()
+				rangeErr error
+			)
+			m.Range(func(k protoreflect.MapKey, v protoreflect.Value) bool {
+				if fd.MapValue().Kind() == protoreflect.MessageKind {
+					elem, err := buildFullBody(v.Message().Interface(), usedFieldsPath)
+					if err != nil {
+						rangeErr = fmt.Errorf("recursive build full body: %w", err)
+						return false
+					}
+					newMap.Set(k, protoreflect.ValueOfMessage(elem.ProtoReflect()))
+				} else {
+					newMap.Set(k, v)
+				}
+				return true
+			})
+			if rangeErr != nil {
+				return nil, fmt.Errorf("map range error: %w", rangeErr)
+			}
+
+		case fd.Kind() == protoreflect.MessageKind:
+			elem, err := buildFullBody(val.Message().Interface(), usedFieldsPath)
+			if err != nil {
+				return nil, fmt.Errorf("recursive build full body: %w", err)
+			}
+			newMsgReflect.Set(fd, protoreflect.ValueOfMessage(elem.ProtoReflect()))
+
+		default:
+			newMsgReflect.Set(fd, val)
+		}
+	}
+
+	return newMsg, nil
+}

builder/body_option.go

@@ -0,0 +1,22 @@
+package builder
+
+const (
+	singleWildcard string = "*"
+	doubleWildcard string = "**"
+)
+
+type bodyOption string
+
+func (o bodyOption) String() string { return string(o) }
+
+func (o bodyOption) isFullBody() bool {
+	return o.String() == singleWildcard
+}
+
+func (o bodyOption) isWithoutBody() bool {
+	return o == ""
+}
+
+func (o bodyOption) isSingleField() bool {
+	return o != "" && o.String() != singleWildcard
+}

builder/body_option_test.go

@@ -0,0 +1,79 @@
+package builder
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestBodyOption_String(t *testing.T) {
+	tests := []struct {
+		name string
+		opt  bodyOption
+		want string
+	}{
+		{"empty", bodyOption(""), ""},
+		{"star", bodyOption("*"), "*"},
+		{"field", bodyOption("field"), "field"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			require.Equal(t, tt.want, tt.opt.String())
+		})
+	}
+}
+
+func TestBodyOption_isFullBody(t *testing.T) {
+	tests := []struct {
+		name string
+		opt  bodyOption
+		want bool
+	}{
+		{"empty", bodyOption(""), false},
+		{"star", bodyOption("*"), true},
+		{"field", bodyOption("field"), false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			require.Equal(t, tt.want, tt.opt.isFullBody())
+		})
+	}
+}
+
+func TestBodyOption_isWithoutBody(t *testing.T) {
+	tests := []struct {
+		name string
+		opt  bodyOption
+		want bool
+	}{
+		{"empty", bodyOption(""), true},
+		{"star", bodyOption("*"), false},
+		{"field", bodyOption("field"), false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			require.Equal(t, tt.want, tt.opt.isWithoutBody())
+		})
+	}
+}
+
+func TestBodyOption_isSingleField(t *testing.T) {
+	tests := []struct {
+		name string
+		opt  bodyOption
+		want bool
+	}{
+		{"empty", bodyOption(""), false},
+		{"star", bodyOption("*"), false},
+		{"field", bodyOption("field"), true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			require.Equal(t, tt.want, tt.opt.isSingleField())
+		})
+	}
+}

builder/helpers.go

@@ -0,0 +1,114 @@
+package builder
+
+import (
+	"encoding/base64"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// findFieldByPath resolves a dot-separated field path in a protobuf message and returns the protoreflect value and its descriptor.
+func findFieldByPath(msg protoreflect.Message, fieldPath string) (protoreflect.Value, protoreflect.FieldDescriptor, bool) {
+	var (
+		current    = msg
+		parts      = strings.Split(fieldPath, ".")
+		partsCount = len(parts) - 1
+	)
+
+	for i, part := range parts {
+		fd, ok := findFieldByName(current, part)
+		if !ok {
+			return protoreflect.Value{}, nil, false
+		}
+
+		val := current.Get(fd)
+		if i == partsCount { // it's last part
+			return val, fd, true
+		}
+
+		if fd.Kind() != protoreflect.MessageKind {
+			return protoreflect.Value{}, nil, false
+		}
+		current = val.Message()
+	}
+
+	return protoreflect.Value{}, nil, false
+}
+
+// findFieldByName find a field name in a protobuf message and returns the protoreflect field descriptor.
+func findFieldByName(msg protoreflect.Message, fieldName string) (protoreflect.FieldDescriptor, bool) {
+	fields := msg.Descriptor().Fields()
+	for i := 0; i < fields.Len(); i++ {
+		fd := fields.Get(i)
+		if fd.JSONName() == fieldName {
+			return fd, true
+		}
+	}
+	return nil, false
+}
+
+// isZeroValue checks if protoreflect.Value is zero for the field.
+func isZeroValue(val protoreflect.Value, fd protoreflect.FieldDescriptor) bool {
+	if fd.IsList() {
+		return val.List().Len() == 0
+	}
+	if fd.IsMap() {
+		return val.Map().Len() == 0
+	}
+
+	switch fd.Kind() {
+	case protoreflect.StringKind:
+		return val.String() == ""
+	case protoreflect.BytesKind:
+		return len(val.Bytes()) == 0
+	case protoreflect.BoolKind:
+		return !val.Bool()
+	case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind,
+		protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
+		return val.Int() == 0
+	case protoreflect.Uint32Kind, protoreflect.Fixed32Kind,
+		protoreflect.Uint64Kind, protoreflect.Fixed64Kind:
+		return val.Uint() == 0
+	case protoreflect.FloatKind, protoreflect.DoubleKind:
+		return val.Float() == 0
+	case protoreflect.EnumKind:
+		return val.Enum() == 0
+	case protoreflect.MessageKind:
+		return !val.Message().IsValid()
+	default:
+		return !val.IsValid()
+	}
+}
+
+// stringifyValue converts protoreflect.Value to string for path/query substitution.
+func stringifyValue(val protoreflect.Value, fd protoreflect.FieldDescriptor) (string, error) {
+	switch fd.Kind() {
+	case protoreflect.StringKind:
+		return val.String(), nil
+	case protoreflect.BytesKind:
+		return base64.StdEncoding.EncodeToString(val.Bytes()), nil
+	case protoreflect.BoolKind:
+		if val.Bool() {
+			return "true", nil
+		}
+		return "false", nil
+	case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind,
+		protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
+		return fmt.Sprintf("%d", val.Int()), nil
+	case protoreflect.Uint32Kind, protoreflect.Fixed32Kind,
+		protoreflect.Uint64Kind, protoreflect.Fixed64Kind:
+		return fmt.Sprintf("%d", val.Uint()), nil
+	case protoreflect.FloatKind, protoreflect.DoubleKind:
+		return strconv.FormatFloat(val.Float(), 'g', -1, 64), nil
+	case protoreflect.EnumKind:
+		ed := fd.Enum().Values().ByNumber(val.Enum())
+		if ed != nil {
+			return string(ed.Name()), nil
+		}
+		return fmt.Sprintf("%d", val.Enum()), nil
+	default:
+		return "", fmt.Errorf("unsupported field kind: %s", fd.Kind())
+	}
+}

builder/path_template.go

@@ -0,0 +1,313 @@
+package builder
+
+import (
+	"errors"
+	"fmt"
+	"net/url"
+	"strings"
+
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// -------------------------- Path template representation -------------------------
+
+// pathSegment is a helper interface for elements of a path.
+type pathSegment interface {
+	isSegment() bool
+}
+
+// pathTemplate represents a parsed URL path template.
+type pathTemplate struct {
+	// literalPrefix is the fixed part of the path before the first {var},
+	// e.g. "/v1/users/" for "/v1/users/{user_id}/orders:get".
+	// It is removed from segments, so segments contain only the remaining path literals and variables.
+	literalPrefix string
+
+	// segments is a sequence of pathLiteral or pathVar representing the rest of the path after literalPrefix.
+	segments []pathSegment
+
+	// customVerb is an optional ":verb" suffix, e.g. ":get".
+	customVerb string
+}
+
+// pathLiteral represents a fixed literal segment in a path template, e.g., "/v1/users/".
+type pathLiteral struct {
+	text string
+}
+
+func (p pathLiteral) isSegment() bool { return true }
+
+// pathVar represents a variable segment in a path template, e.g., "{user.id}".
+type pathVar struct {
+	// fieldPath is the dotted path to the field in the struct, e.g., "user.id".
+	fieldPath string
+
+	// pattern is the optional pattern after '=', e.g., "*" or "**/orders".
+	// It specifies how the variable can match parts of the URL path.
+	pattern string
+
+	// multiSegment is true if the pattern can match multiple path segments
+	// (contains '/' or "**").
+	multiSegment bool
+}
+
+func (p pathVar) isSegment() bool { return true }
+
+// ----------------------------- Path template parsing -----------------------------
+
+// parsePathTemplate parses a URL path template into a pathTemplate.
+// It extracts:
+//  1. literalPrefix — fixed part before the first variable,
+//  2. segments — sequence of pathLiteral and pathVar,
+//  3. customVerb — optional ":verb" suffix.
+//
+// Complexity: time O(n), memory O(n).
+//
+// Example:
+//
+//	input: "/v1/users/{user_id}/orders:get"
+//	output: pathTemplate{
+//	  literalPrefix: "/v1/users/",
+//	  segments:      [{user_id}, "/orders"],
+//	  customVerb:    ":get",
+//	}
+func parsePathTemplate(input string) (*pathTemplate, error) {
+	// Step 1: extract custom verb after the last colon, e.g. ":get"
+	var customVerb string
+	if i := strings.LastIndex(input, ":"); i >= 0 && i > strings.LastIndex(input, "/") {
+		customVerb = input[i:]
+		input = input[:i]
+	}
+
+	var (
+		segments []pathSegment
+		buf      strings.Builder
+	)
+
+	// Step 2: iterate over the input and split into segments
+	for i := 0; i < len(input); {
+		if input[i] != '{' {
+			buf.WriteByte(input[i])
+			i++
+			continue
+		}
+
+		// Add literal before '{' if any
+		if buf.Len() > 0 {
+			segments = append(segments, pathLiteral{text: buf.String()})
+			buf.Reset()
+		}
+
+		// Find closing '}'
+		start := i + 1
+		offset := strings.IndexByte(input[start:], '}') // relative offset from start
+		if offset < 0 {
+			return nil, fmt.Errorf("unclosed '{' in path: %s", input)
+		}
+		end := start + offset
+
+		token := input[start:end]
+		i = end + 1 // jump past '}'
+
+		// Split field path and optional pattern
+		var fieldPath, pattern string
+		if k := strings.IndexByte(token, '='); k >= 0 {
+			fieldPath = strings.TrimSpace(token[:k])
+			pattern = strings.TrimSpace(token[k+1:])
+		} else {
+			fieldPath = strings.TrimSpace(token)
+		}
+
+		if fieldPath == "" {
+			return nil, fmt.Errorf("empty variable in path: %s", input)
+		}
+
+		pv := pathVar{
+			fieldPath:    fieldPath,
+			pattern:      pattern,
+			multiSegment: isMultiSegmentPattern(pattern),
+		}
+		segments = append(segments, pv)
+	}
+
+	// Step 3: add any trailing literal after last '}'
+	if buf.Len() > 0 {
+		segments = append(segments, pathLiteral{text: buf.String()})
+	}
+
+	// Step 4: extract literalPrefix if the first segment is a literal
+	var literalPrefix string
+	if len(segments) > 0 {
+		if pl, ok := segments[0].(pathLiteral); ok {
+			literalPrefix = pl.text
+			segments = segments[1:] // remove from segments to avoid duplication
+		}
+	}
+
+	// Step 5: return fully parsed pathTemplate
+	return &pathTemplate{
+		literalPrefix: literalPrefix,
+		segments:      segments,
+		customVerb:    customVerb,
+	}, nil
+}
+
+// isMultiSegmentPattern returns true if pattern can match multiple path segments (contains '/' or '**').
+// Examples:
+// | 	Pattern     | Result | 					Usecase					|
+// |----------------|--------|------------------------------------------|
+// | ""             | false  | {var} 			=> single segment		|
+// | "*"            | false  | {var=*} 			=> single segment		|
+// | "**"           | true   | {var=**} 		=> multiple segments	|
+// | "foo/*"        | true   | {var=foo/*} 		=> multiple segments	|
+// | "foo/**"       | true   | {var=foo/**} 	=> multiple segments	|
+// | "users/*/orders"| true  | {users/*/orders} => multiple segments	|
+func isMultiSegmentPattern(pattern string) bool {
+	if pattern == "" {
+		return false
+	}
+	if pattern == singleWildcard {
+		return false
+	}
+	return strings.Contains(pattern, "/") || strings.Contains(pattern, doubleWildcard)
+}
+
+// ----------------------------- Path template resolving -----------------------------
+
+// resolvePathPlaceholders expands placeholders in a path template using values from proto.Message.
+// Placeholders must be bound to non-repeated scalar fields (not lists, maps, or messages).
+//
+// Example:
+//
+//	tmpl:       "/v1/users/{user_id}/orders:get"
+//	msg:        &pb.Message{UserId: 12345}
+//
+//	path:       "/v1/users/12345/orders:get"
+//	usedFields: {"user_id"}
+func resolvePathPlaceholders(tmpl *pathTemplate, msg proto.Message) (path string, usedFields *usedFields, err error) {
+	usedFields = newUsedFields()
+
+	var sb strings.Builder
+	sb.WriteString(tmpl.literalPrefix)
+
+	msgReflect := msg.ProtoReflect()
+
+	for _, segment := range tmpl.segments {
+		switch s := segment.(type) {
+		case pathLiteral:
+			sb.WriteString(s.text)
+
+		case pathVar:
+			val, fd, ok := findFieldByPath(msgReflect, s.fieldPath)
+			if !ok {
+				return "", nil, fmt.Errorf("path placeholder %s not found", s.fieldPath)
+			}
+			if isZeroValue(val, fd) {
+				// it's the only case that allows zero-value matches.
+				if s.pattern == doubleWildcard {
+					usedFields.add(s.fieldPath)
+					continue
+				}
+				return "", nil, fmt.Errorf("path placeholder %s has zero value", s.fieldPath)
+			}
+
+			// must be scalar (non-repeated, non-map, non-message)
+			if fd.IsList() || fd.IsMap() || fd.Kind() == protoreflect.MessageKind {
+				return "", nil, fmt.Errorf("path placeholder %s must be scalar", s.fieldPath)
+			}
+
+			usedFields.add(s.fieldPath)
+
+			var strVal string
+			strVal, err = stringifyValue(val, fd)
+			if err != nil {
+				return "", nil, fmt.Errorf("stringify placeholder %s: %w", s.fieldPath, err)
+			}
+
+			if err = validatePattern(s.pattern, strVal); err != nil {
+				return "", nil, fmt.Errorf("validate pattern, %s:%s: %w", s.fieldPath, strVal, err)
+			}
+
+			parts := strings.Split(strVal, "/")
+			for i := range parts {
+				parts[i] = url.PathEscape(parts[i])
+			}
+			sb.WriteString(strings.Join(parts, "/"))
+		}
+	}
+
+	sb.WriteString(tmpl.customVerb)
+	return sb.String(), usedFields, nil
+}
+
+// validatePattern checks whether input matches the given path pattern.
+//
+// Rules:
+//   - "" or "*" => exactly one segment, no "/" allowed
+//   - "**"      => zero or more segments (may include "/")
+//   - composite patterns like "*/orders/*" must match literally
+//
+// Example for composite pattern case:
+//
+//	pattern: "*/orders/*"
+//	input:   "42/orders/123"
+//
+//	patternSegments = ["*", "orders", "*"]
+//	valueParts      = ["42", "orders", "123"]
+//
+//	Match:
+//	  "*"      -> "42"
+//	  "orders" -> "orders"
+//	  "*"      -> "123"
+func validatePattern(pattern, input string) error {
+	var (
+		parts    = strings.Split(input, "/")
+		lenParts = len(parts)
+	)
+
+	if pattern == "" || pattern == singleWildcard {
+		if lenParts != 1 {
+			return errors.New("must be a single path segment")
+		}
+		return nil
+	}
+
+	if pattern == doubleWildcard {
+		if lenParts < 1 {
+			return errors.New("must contain at least one segment")
+		}
+		return nil
+	}
+
+	var (
+		patternSegments = strings.Split(pattern, "/")
+		patternIndex    int
+	)
+
+	for i := 0; i < len(patternSegments); i++ {
+		switch patternSegments[i] {
+		case singleWildcard:
+			if patternIndex >= lenParts || parts[patternIndex] == "" {
+				return fmt.Errorf("segment %d must not be empty", patternIndex)
+			}
+			patternIndex++
+		case doubleWildcard:
+			if patternIndex >= lenParts {
+				return fmt.Errorf("must contain at least one segment at position %d", patternIndex)
+			}
+			return nil
+		default:
+			if patternIndex >= lenParts || parts[patternIndex] != patternSegments[i] {
+				return fmt.Errorf("expected literal %s at position %d", patternSegments[i], patternIndex)
+			}
+			patternIndex++
+		}
+	}
+
+	if patternIndex != lenParts {
+		return errors.New("extra segments in value")
+	}
+
+	return nil
+}

builder/path_template_cache.go

@@ -0,0 +1,21 @@
+package builder
+
+import "sync"
+
+var (
+	pathTemplateCache   = make(map[string]*pathTemplate)
+	pathTemplateCacheMu sync.RWMutex
+)
+
+func getCachedPathTemplate(path string) (*pathTemplate, bool) {
+	pathTemplateCacheMu.RLock()
+	defer pathTemplateCacheMu.RUnlock()
+	tmpl, ok := pathTemplateCache[path]
+	return tmpl, ok
+}
+
+func setPathTemplateCache(path string, tmpl *pathTemplate) {
+	pathTemplateCacheMu.Lock()
+	defer pathTemplateCacheMu.Unlock()
+	pathTemplateCache[path] = tmpl
+}

builder/proto/errors.pb.go

@@ -0,0 +1,15 @@
+package proto
+
+import "google.golang.org/protobuf/encoding/protojson"
+
+var marshaler = protojson.MarshalOptions{}
+
+func (m *Test_Client_Call_DefaultError) Error() string {
+	buf, _ := marshaler.Marshal(m)
+	return string(buf)
+}
+
+func (m *Test_Client_Call_SpecialError) Error() string {
+	buf, _ := marshaler.Marshal(m)
+	return string(buf)
+}

builder/proto/test_messages.proto

@@ -0,0 +1,330 @@
+syntax = "proto3";
+
+package proto;
+
+option go_package = "go.unistack.org/micro-client-http/v4/proto;proto";
+
+message TestRequestBuilder {}
+
+message Test_PathOnly {
+  message PrimitiveCase {
+    string userId = 1 [json_name = "user_id"];
+    int64  orderId = 2 [json_name = "order_id"];
+  }
+
+  message NestedCase {
+    User user = 1;
+    Order order = 2;
+
+    message User {
+      string id = 1;
+    }
+    message Order {
+      int64 id = 1;
+      Product product = 2;
+
+      message Product {
+        int64 id = 1;
+      }
+    }
+  }
+
+  message MultipleCase {
+    string userId = 1 [json_name = "user_id"];
+    Order order = 2;
+
+    message Order {
+      string id = 1;
+    }
+  }
+
+  message RepeatedCase {
+    repeated string userId = 1 [json_name = "user_id"];
+    int64  orderId = 2 [json_name = "order_id"];
+  }
+
+  message NonPrimitiveMessageCase {
+    User userId = 1 [json_name = "user_id"];
+    int64  orderId = 2 [json_name = "order_id"];
+
+    message User {
+      string id = 1;
+    }
+  }
+
+  message NonPrimitiveMapCase {
+    map<string, string> userId = 1 [json_name = "user_id"];
+    int64  orderId = 2 [json_name = "order_id"];
+  }
+
+  message PatternCase {
+    string pattern = 1;
+  }
+
+  message CompositePatternCase {
+    string pattern = 1;
+    string orderId = 2 [json_name = "order_id"];
+    string productId = 3 [json_name = "product_id"];
+  }
+}
+
+message Test_QueryOnly {
+  message PrimitiveCase {
+    string userId = 1 [json_name = "user_id"];
+    int64  orderId = 2 [json_name = "order_id"];
+    bool flag = 3;
+  }
+
+  message RepeatedCase {
+    repeated string strings = 1;
+    repeated int64 integers = 2;
+  }
+
+  message NestedMessageCase {
+    string userId = 1 [json_name = "user_id"];
+    Filter filter = 2;
+
+    message Filter {
+      int64 age = 1;
+      string name = 2;
+      SubFilter subFilter = 3 [json_name = "sub_filter"];
+
+      message SubFilter {
+        int64 subAge = 1 [json_name = "sub_age"];
+        string subName = 2 [json_name = "sub_name"];
+      }
+    }
+  }
+
+  message NestedMapCase {
+    string userId = 1 [json_name = "user_id"];
+    map<string, string> firstFilter = 2 [json_name = "first_filter"];
+    map<string, SubFilter> secondFilter = 4 [json_name = "second_filter"];
+    message SubFilter {
+      int64 subAge = 1 [json_name = "sub_age"];
+      string subName = 2 [json_name = "sub_name"];
+    }
+  }
+
+  message MultipleCase {
+    string userId = 1 [json_name = "user_id"];
+    repeated string strings = 2;
+    Filter firstFilter = 3 [json_name = "first_filter"];
+    map<string, SubFilter> secondFilter = 4 [json_name = "second_filter"];
+
+    message Filter {
+      int64 age = 1;
+      SubFilter subFilter = 2 [json_name = "sub_filter"];
+    }
+    message SubFilter {
+      int64 subAge = 1 [json_name = "sub_age"];
+    }
+  }
+
+  message RepeatedMessageCase {
+    repeated Filter filters = 1;
+    message Filter {
+      int64 age = 1;
+    }
+  }
+}
+
+message Test_BodyOnly {
+  message PrimitiveCase {
+    string userId = 1 [json_name = "user_id"];
+    int64  orderId = 2 [json_name = "order_id"];
+    bool flag = 3;
+    repeated string strings = 4;
+    Product product = 6;
+
+    message Product {
+      string id = 1;
+      string name = 2;
+    }
+  }
+
+  message NestedCase {
+    string userId = 1 [json_name = "user_id"];
+    Filter first_filter = 2 [json_name = "first_filter"];
+    Filter second_filter = 3 [json_name = "second_filter"];
+
+    message Filter {
+      int64 age = 1;
+      string name = 2;
+      SubFilter subFilter = 3 [json_name = "sub_filter"];
+
+      message SubFilter {
+        int64 subAge = 1 [json_name = "sub_age"];
+        string subName = 2 [json_name = "sub_name"];
+      }
+    }
+  }
+
+  message RepeatedMessageCase {
+    string userId = 1 [json_name = "user_id"];
+    repeated Product products = 2 [json_name = "products"];
+
+    message Product {
+      string id = 1;
+      string name = 2;
+    }
+  }
+
+  message MapCase {
+    map<string, string> firstFilter = 1 [json_name = "first_filter"];
+    map<string, SubFilter> secondFilter = 2 [json_name = "second_filter"];
+
+    message SubFilter {
+      int64 subAge = 1 [json_name = "sub_age"];
+      string subName = 2 [json_name = "sub_name"];
+    }
+  }
+
+  message MultipleCase {
+    string userId = 1 [json_name = "user_id"];
+    repeated SubFilter firstFilter = 2 [json_name = "first_filter"];
+    map<string, SubFilter> secondFilter = 3 [json_name = "second_filter"];
+    SubFilter thirdFilter = 4 [json_name = "third_filter"];
+
+    message SubFilter {
+      int64 subAge = 1 [json_name = "sub_age"];
+      string subName = 2 [json_name = "sub_name"];
+    }
+  }
+}
+
+message Test_Mixed {
+  message PrimitiveCase {
+    string userId = 1 [json_name = "user_id"];
+    int64  orderId = 2 [json_name = "order_id"];
+    Product product = 3;
+
+    message Product {
+      string id = 1;
+      string name = 2;
+    }
+  }
+
+  message NestedCase {
+    string userId = 1 [json_name = "user_id"];
+    Filter first_filter = 2 [json_name = "first_filter"];
+    Filter second_filter = 3 [json_name = "second_filter"];
+
+    message Filter {
+      int64 age = 1;
+      string name = 2;
+      SubFilter subFilter = 3 [json_name = "sub_filter"];
+
+      message SubFilter {
+        int64 subAge = 1 [json_name = "sub_age"];
+        string subName = 2 [json_name = "sub_name"];
+      }
+    }
+  }
+
+  message RepeatedMessageCase {
+    string userId = 1 [json_name = "user_id"];
+    repeated Product products = 2 [json_name = "products"];
+
+    message Product {
+      string id = 1;
+      string name = 2;
+    }
+  }
+
+  message MapCase {
+    map<string, string> firstFilter = 1 [json_name = "first_filter"];
+    map<string, SubFilter> secondFilter = 2 [json_name = "second_filter"];
+
+    message SubFilter {
+      int64 subAge = 1 [json_name = "sub_age"];
+      string subName = 2 [json_name = "sub_name"];
+    }
+  }
+
+  message MultipleCase {
+    string userId = 1 [json_name = "user_id"];
+    repeated SubFilter firstFilter = 2 [json_name = "first_filter"];
+    map<string, SubFilter> secondFilter = 3 [json_name = "second_filter"];
+    SubFilter thirdFilter = 4 [json_name = "third_filter"];
+
+    message SubFilter {
+      int64 subAge = 1 [json_name = "sub_age"];
+      string subName = 2 [json_name = "sub_name"];
+    }
+  }
+}
+
+message Benchmark {
+  message Case5 {
+    string field1 = 1;
+    string field2 = 2;
+    string field3 = 3;
+    string field4 = 4;
+    string field5 = 5;
+  }
+  message Case10 {
+    string field1 = 1;
+    string field2 = 2;
+    string field3 = 3;
+    string field4 = 4;
+    string field5 = 5;
+    string field6 = 6;
+    string field7 = 7;
+    string field8 = 8;
+    string field9 = 9;
+    string field10 = 10;
+  }
+  message Case30 {
+    string field1 = 1;
+    string field2 = 2;
+    string field3 = 3;
+    string field4 = 4;
+    string field5 = 5;
+    string field6 = 6;
+    string field7 = 7;
+    string field8 = 8;
+    string field9 = 9;
+    string field10 = 10;
+    string field11 = 11;
+    string field12 = 12;
+    string field13 = 13;
+    string field14 = 14;
+    string field15 = 15;
+    string field16 = 16;
+    string field17 = 17;
+    string field18 = 18;
+    string field19 = 19;
+    string field20 = 20;
+    string field21 = 21;
+    string field22 = 22;
+    string field23 = 23;
+    string field24 = 24;
+    string field25 = 25;
+    string field26 = 26;
+    string field27 = 27;
+    string field28 = 28;
+    string field29 = 29;
+    string field30 = 30;
+  }
+}
+
+message Test_Client_Call {
+  message Request {
+    string userId = 1 [json_name = "user_id"];
+    int64  orderId = 2 [json_name = "order_id"];
+  }
+  message Response {
+    string id = 1;
+    string name = 2;
+  }
+  message DefaultError {
+    string code = 1;
+    string msg = 2;
+  }
+  message SpecialError {
+    string code = 1;
+    string msg = 2;
+    string warning = 3;
+  }
+}

builder/query.go

@@ -0,0 +1,194 @@
+package builder
+
+import (
+	"fmt"
+	"net/url"
+
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+func buildQuery(msg proto.Message, usedFieldsPath *usedFields, usedFieldBody string) (url.Values, error) {
+	var (
+		query      = url.Values{}
+		msgReflect = msg.ProtoReflect()
+	)
+
+	fields := msgReflect.Descriptor().Fields()
+	for i := 0; i < fields.Len(); i++ {
+		var (
+			fd        = fields.Get(i)
+			fieldName = fd.JSONName()
+		)
+
+		if usedFieldsPath.hasFullKey(fieldName) {
+			continue
+		}
+		if fieldName == usedFieldBody {
+			continue
+		}
+
+		val := msgReflect.Get(fd)
+		if isZeroValue(val, fd) {
+			continue
+		}
+
+		// Note: order of the cases is important!
+		switch {
+		case fd.IsList():
+			if fd.Kind() == protoreflect.MessageKind {
+				return nil, fmt.Errorf("repeated message field %s cannot be mapped to URL query parameters", fieldName)
+			}
+			list := val.List()
+			for j := 0; j < list.Len(); j++ {
+				strVal, err := stringifyValue(list.Get(j), fd)
+				if err != nil {
+					return nil, fmt.Errorf("stringify value for query %s: %w", fieldName, err)
+				}
+				query.Add(fieldName, strVal)
+			}
+
+		case fd.IsMap():
+			var (
+				m        = val.Map()
+				rangeErr error
+			)
+			m.Range(func(k protoreflect.MapKey, v protoreflect.Value) bool {
+				key := fmt.Sprintf("%s.%s", fieldName, k.String())
+
+				if fd.MapValue().Kind() == protoreflect.MessageKind {
+					flattened, err := flattenMsgForQuery(key, v.Message())
+					if err != nil {
+						rangeErr = fmt.Errorf("flatten msg for query %s: %w", fieldName, err)
+						return false
+					}
+					for _, item := range flattened {
+						if item.val == "" {
+							continue
+						}
+						if usedFieldsPath.hasFullKey(item.key) {
+							continue
+						}
+						query.Add(item.key, item.val)
+					}
+				} else {
+					strVal, err := stringifyValue(v, fd.MapValue())
+					if err != nil {
+						rangeErr = fmt.Errorf("stringify value for map %s: %w", fieldName, err)
+						return false
+					}
+					query.Add(key, strVal)
+				}
+				return true
+			})
+			if rangeErr != nil {
+				return nil, fmt.Errorf("map range error: %w", rangeErr)
+			}
+
+		case fd.Kind() == protoreflect.MessageKind:
+			flattened, err := flattenMsgForQuery(fieldName, val.Message())
+			if err != nil {
+				return nil, fmt.Errorf("flatten msg for query %s: %w", fieldName, err)
+			}
+			for _, item := range flattened {
+				if item.val == "" {
+					continue
+				}
+				if usedFieldsPath.hasFullKey(item.key) {
+					continue
+				}
+				query.Add(item.key, item.val)
+			}
+
+		default:
+			strVal, err := stringifyValue(val, fd)
+			if err != nil {
+				return nil, fmt.Errorf("stringify value for primitive %s: %w", fieldName, err)
+			}
+			query.Add(fieldName, strVal)
+		}
+	}
+
+	return query, nil
+}
+
+type flattenItem struct {
+	key string
+	val string
+}
+
+// flattenMsgForQuery flattens a non-repeated message value under a given prefix.
+func flattenMsgForQuery(prefix string, msg protoreflect.Message) ([]flattenItem, error) {
+	var out []flattenItem
+
+	fields := msg.Descriptor().Fields()
+	for i := 0; i < fields.Len(); i++ {
+		var (
+			fd  = fields.Get(i)
+			val = msg.Get(fd)
+		)
+
+		if isZeroValue(val, fd) {
+			continue
+		}
+
+		key := fmt.Sprintf("%s.%s", prefix, fd.JSONName())
+
+		switch {
+		case fd.IsList():
+			if fd.Kind() == protoreflect.MessageKind {
+				return nil, fmt.Errorf("repeated message field %s cannot be flattened for query", key)
+			}
+			list := val.List()
+			for j := 0; j < list.Len(); j++ {
+				strVal, err := stringifyValue(list.Get(j), fd)
+				if err != nil {
+					return nil, fmt.Errorf("stringify query %s: %w", key, err)
+				}
+				out = append(out, flattenItem{key: key, val: strVal})
+			}
+
+		case fd.Kind() == protoreflect.MessageKind:
+			nested, err := flattenMsgForQuery(key, val.Message())
+			if err != nil {
+				return nil, fmt.Errorf("flatten msg for query %s: %w", key, err)
+			}
+			out = append(out, nested...)
+
+		case fd.IsMap():
+			var mapErr error
+			val.Map().Range(func(k protoreflect.MapKey, v protoreflect.Value) bool {
+				keyStr := k.String()
+
+				if fd.MapValue().Kind() == protoreflect.MessageKind {
+					child, err := flattenMsgForQuery(keyStr, v.Message())
+					if err != nil {
+						mapErr = fmt.Errorf("flatten map value %s: %w", key, err)
+						return false
+					}
+					out = append(out, child...)
+				} else {
+					strVal, err := stringifyValue(v, fd.MapValue())
+					if err != nil {
+						mapErr = fmt.Errorf("stringify query %s: %w", keyStr, err)
+						return false
+					}
+					out = append(out, flattenItem{key: keyStr, val: strVal})
+				}
+				return true
+			})
+			if mapErr != nil {
+				return nil, mapErr
+			}
+
+		default:
+			strVal, err := stringifyValue(val, fd)
+			if err != nil {
+				return nil, fmt.Errorf("stringify query %s: %w", key, err)
+			}
+			out = append(out, flattenItem{key: key, val: strVal})
+		}
+	}
+
+	return out, nil
+}

builder/request_builder.go

@@ -0,0 +1,180 @@
+// Package builder implements google.api.http-style request building (gRPC JSON transcoding)
+// for HTTP requests, closely following the google.api.http spec.
+// See full spec for details: https://github.com/googleapis/googleapis/blob/master/google/api/http.proto
+package builder
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+type RequestBuilder struct {
+	path       string        // e.g. "/v1/{name=projects/*/topics/*}:publish" or "/users/{user.id}"
+	method     string        // GET, POST, PATCH, etc. (not used in mapping rules, but convenient for callers)
+	bodyOption bodyOption    // "", "*", or top-level field name
+	msg        proto.Message // request struct
+}
+
+func NewRequestBuilder(
+	path string,
+	method string,
+	bodyOpt string,
+	msg proto.Message,
+) (
+	*RequestBuilder,
+	error,
+) {
+	rb := &RequestBuilder{
+		path:       path,
+		method:     method,
+		bodyOption: bodyOption(bodyOpt),
+		msg:        msg,
+	}
+
+	if err := rb.validate(); err != nil {
+		return nil, fmt.Errorf("validate: %w", err)
+	}
+
+	return rb, nil
+}
+
+// Build applies mapping rules and returns:
+//
+//	resolvedPath — path with placeholders substituted and query appended
+//	newMsg       — same concrete type as input, filtered to contain only the body fields
+//	err          — if mapping/validation failed
+func (b *RequestBuilder) Build() (resolvedPath string, newMsg proto.Message, err error) {
+	tmpl, isCached := getCachedPathTemplate(b.path)
+	if !isCached {
+		tmpl, err = parsePathTemplate(b.path)
+		if err != nil {
+			return "", nil, fmt.Errorf("parse path template: %w", err)
+		}
+		setPathTemplateCache(b.path, tmpl)
+	}
+
+	var usedFieldsPath *usedFields
+	resolvedPath, usedFieldsPath, err = resolvePathPlaceholders(tmpl, b.msg)
+	if err != nil {
+		return "", nil, fmt.Errorf("resolve path placeholders: %w", err)
+	}
+
+	// if all set fields are already used in path, no need to process query/body
+	if allFieldsUsed(b.msg, usedFieldsPath) {
+		return resolvedPath, initZeroMsg(b.msg), nil
+	}
+
+	switch {
+	case b.bodyOption.isWithoutBody():
+		var query url.Values
+		query, err = buildQuery(b.msg, usedFieldsPath, "")
+		if err != nil {
+			return "", nil, fmt.Errorf("build query: %w", err)
+		}
+
+		return resolvedPath + encodeQuery(query), initZeroMsg(b.msg), nil
+
+	case b.bodyOption.isSingleField():
+		fieldBody := b.bodyOption.String()
+
+		newMsg, err = buildSingleFieldBody(b.msg, fieldBody)
+		if err != nil {
+			return "", nil, fmt.Errorf("build single field body: %w", err)
+		}
+
+		var query url.Values
+		query, err = buildQuery(b.msg, usedFieldsPath, fieldBody)
+		if err != nil {
+			return "", nil, fmt.Errorf("build query: %w", err)
+		}
+
+		return resolvedPath + encodeQuery(query), newMsg, nil
+
+	case b.bodyOption.isFullBody():
+		newMsg, err = buildFullBody(b.msg, usedFieldsPath)
+		if err != nil {
+			return "", nil, fmt.Errorf("build full body: %w", err)
+		}
+
+		return resolvedPath, newMsg, nil
+
+	default:
+		return "", nil, fmt.Errorf("unsupported body option %s", b.bodyOption.String())
+	}
+}
+
+func (b *RequestBuilder) validate() error {
+	if b.path == "" {
+		return errors.New("path is empty")
+	}
+	if err := validateHTTPMethod(b.method); err != nil {
+		return fmt.Errorf("validate http method: %w", err)
+	}
+	if err := validateHTTPMethodAndBody(b.method, b.bodyOption); err != nil {
+		return fmt.Errorf("validate http method and body: %w", err)
+	}
+	if b.msg == nil {
+		return errors.New("msg is nil")
+	}
+	return nil
+}
+
+func validateHTTPMethod(method string) error {
+	switch strings.ToUpper(method) {
+	case http.MethodGet,
+		http.MethodHead,
+		http.MethodPost,
+		http.MethodPut,
+		http.MethodPatch,
+		http.MethodDelete,
+		http.MethodConnect,
+		http.MethodOptions,
+		http.MethodTrace:
+		return nil
+	default:
+		return errors.New("invalid http method")
+	}
+}
+
+func validateHTTPMethodAndBody(method string, bodyOpt bodyOption) error {
+	switch method {
+	case http.MethodGet, http.MethodDelete, http.MethodHead, http.MethodOptions:
+		if !bodyOpt.isWithoutBody() {
+			return fmt.Errorf("%s method must not have a body", method)
+		}
+	}
+	return nil
+}
+
+func allFieldsUsed(msg proto.Message, used *usedFields) bool {
+	if used.len() == 0 {
+		return false
+	}
+	count := 0
+	msg.ProtoReflect().Range(func(protoreflect.FieldDescriptor, protoreflect.Value) bool {
+		count++
+		return true
+	})
+	return used.len() == count
+}
+
+func encodeQuery(query url.Values) string {
+	if len(query) == 0 {
+		return ""
+	}
+	enc := query.Encode()
+	if enc == "" {
+		return ""
+	}
+	return "?" + enc
+}
+
+func initZeroMsg(msg proto.Message) proto.Message {
+	return msg.ProtoReflect().New().Interface()
+}

builder/request_builder_bench_test.go

@@ -0,0 +1,149 @@
+package builder
+
+import (
+	"fmt"
+	"math/rand"
+	"strings"
+	"testing"
+	"time"
+
+	"google.golang.org/protobuf/proto"
+
+	pb "go.unistack.org/micro-client-http/v4/builder/proto"
+)
+
+// sink prevents the compiler from optimizing away parsePathTemplate results.
+var sink *pathTemplate
+
+func BenchmarkParsePathTemplate(b *testing.B) {
+	r := rand.New(rand.NewSource(1))
+
+	benchInput := func(size int) string {
+		sb := strings.Builder{}
+		sb.Grow(size * 10)
+
+		for i := 0; i < size; i++ {
+			name := fmt.Sprintf("var%d", r.Intn(1000))
+
+			if r.Intn(5) == 0 {
+				sb.WriteString(fmt.Sprintf("{%s=**}", name))
+			} else {
+				sb.WriteString(fmt.Sprintf("{%s}", name))
+			}
+		}
+		return sb.String()
+	}
+
+	sizes := []int{1_000, 10_000, 50_000, 100_000}
+	for _, size := range sizes {
+		input := benchInput(size)
+		b.Run(fmt.Sprintf("N=%d", size), func(b *testing.B) {
+			b.ReportAllocs()
+			for i := 0; i < b.N; i++ {
+				var err error
+				sink, err = parsePathTemplate(input)
+				if err != nil && testing.Verbose() {
+					b.Fatal(err)
+				}
+			}
+		})
+	}
+}
+
+func BenchmarkRequestBuilder(b *testing.B) {
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+
+	makeMsg := func(fieldCount int) proto.Message {
+		switch fieldCount {
+		case 5:
+			return &pb.Benchmark_Case5{
+				Field1: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field2: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field3: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field4: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field5: fmt.Sprintf("value%d", r.Intn(1000)),
+			}
+		case 10:
+			return &pb.Benchmark_Case10{
+				Field1:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field2:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field3:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field4:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field5:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field6:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field7:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field8:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field9:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field10: fmt.Sprintf("value%d", r.Intn(1000)),
+			}
+		case 30:
+			return &pb.Benchmark_Case30{
+				Field1:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field2:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field3:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field4:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field5:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field6:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field7:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field8:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field9:  fmt.Sprintf("value%d", r.Intn(1000)),
+				Field10: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field11: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field12: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field13: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field14: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field15: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field16: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field17: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field18: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field19: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field20: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field21: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field22: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field23: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field24: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field25: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field26: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field27: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field28: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field29: fmt.Sprintf("value%d", r.Intn(1000)),
+				Field30: fmt.Sprintf("value%d", r.Intn(1000)),
+			}
+		default:
+			b.Fatal("undefined field count")
+			return nil
+		}
+	}
+
+	tests := []struct {
+		name       string
+		pathTmpl   string
+		bodyOption string
+	}{
+		{"all fields in path", "/resource/{field1}/{field2}", ""},
+		{"single field body", "/resource/{field1}", "field4"},
+		{"full body", "/resource", "*"},
+	}
+
+	for _, fields := range []int{5, 10, 30} {
+		for _, tt := range tests {
+			b.Run(fmt.Sprintf("%s_%d_fields", tt.name, fields), func(b *testing.B) {
+				b.ReportAllocs()
+				b.ResetTimer()
+
+				for i := 0; i < b.N; i++ {
+					msg := makeMsg(fields)
+					rb, err := NewRequestBuilder(tt.pathTmpl, "POST", tt.bodyOption, msg)
+					if err != nil {
+						b.Fatalf("new request builder: %v", err)
+					}
+
+					_, _, err = rb.Build()
+					if err != nil {
+						b.Fatalf("build: %v", err)
+					}
+				}
+			})
+		}
+	}
+}

builder/used_fields.go

@@ -0,0 +1,44 @@
+package builder
+
+import "strings"
+
+// usedFields stores keys and their top-level parts,
+// turning top-level lookups from O(N) into O(1).
+type usedFields struct {
+	full map[string]struct{}
+	top  map[string]struct{}
+}
+
+func newUsedFields() *usedFields {
+	return &usedFields{
+		full: make(map[string]struct{}),
+		top:  make(map[string]struct{}),
+	}
+}
+
+// add inserts a new key and updates the top-level index.
+func (u *usedFields) add(key string) {
+	u.full[key] = struct{}{}
+	top := key
+	if i := strings.IndexByte(key, '.'); i != -1 {
+		top = key[:i]
+	}
+	u.top[top] = struct{}{}
+}
+
+// hasTopLevelKey checks if a top-level key exists.
+func (u *usedFields) hasTopLevelKey(top string) bool {
+	_, ok := u.top[top]
+	return ok
+}
+
+// hasFullKey checks if an exact key exists.
+func (u *usedFields) hasFullKey(key string) bool {
+	_, ok := u.full[key]
+	return ok
+}
+
+// len returns the number of full keys stored in the set.
+func (u *usedFields) len() int {
+	return len(u.full)
+}

builder/used_fields_test.go

@@ -0,0 +1,78 @@
+package builder
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewUsedFields(t *testing.T) {
+	u := newUsedFields()
+	require.NotNil(t, u)
+	require.NotNil(t, u.full)
+	require.NotNil(t, u.top)
+	require.Len(t, u.full, 0)
+	require.Len(t, u.top, 0)
+}
+
+func TestUsedFields_Add(t *testing.T) {
+	u := newUsedFields()
+
+	u.add("user.name")
+	u.add("profile")
+
+	_, ok := u.full["user.name"]
+	require.True(t, ok)
+
+	_, ok = u.full["profile"]
+	require.True(t, ok)
+
+	_, ok = u.top["user"]
+	require.True(t, ok)
+
+	_, ok = u.top["profile"]
+	require.True(t, ok)
+
+	require.Len(t, u.full, 2)
+	require.Len(t, u.top, 2)
+}
+
+func TestUsedFields_HasFullKey(t *testing.T) {
+	u := newUsedFields()
+	u.add("user.name")
+
+	require.True(t, u.hasFullKey("user.name"))
+	require.False(t, u.hasFullKey("user.email"))
+}
+
+func TestUsedFields_HasTopLevelKey(t *testing.T) {
+	u := newUsedFields()
+	u.add("user.name")
+	u.add("settings.theme")
+
+	require.True(t, u.hasTopLevelKey("user"))
+	require.True(t, u.hasTopLevelKey("settings"))
+	require.False(t, u.hasTopLevelKey("profile"))
+}
+
+func TestUsedFields_AddDuplicate(t *testing.T) {
+	u := newUsedFields()
+	u.add("user.name")
+	u.add("user.name")
+
+	require.True(t, u.hasFullKey("user.name"))
+	require.True(t, u.hasTopLevelKey("user"))
+	require.Len(t, u.full, 1)
+	require.Len(t, u.top, 1)
+}
+
+func TestUsedFields_Len(t *testing.T) {
+	u := newUsedFields()
+
+	u.add("user.name")
+	u.add("profile")
+	u.add("user.name")
+	u.add("profile")
+
+	require.Equal(t, u.len(), 2)
+}

client.go

@@ -0,0 +1,122 @@
+package http
+
+import (
+	"context"
+	"net/http"
+	"strconv"
+	"sync"
+	"time"
+
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/errors"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/semconv"
+	"go.unistack.org/micro/v4/tracer"
+)
+
+var DefaultContentType = "application/json"
+
+type Client struct {
+	funcCall   client.FuncCall
+	funcStream client.FuncStream
+	httpClient *http.Client
+	opts       client.Options
+	mu         sync.RWMutex
+}
+
+func NewClient(opts ...client.Option) *Client {
+	clientOpts := client.NewOptions(opts...)
+
+	if len(clientOpts.ContentType) == 0 {
+		clientOpts.ContentType = DefaultContentType
+	}
+
+	c := &Client{opts: clientOpts}
+
+	dialer, ok := httpDialerFromOpts(clientOpts)
+	if !ok {
+		dialer = defaultHTTPDialer()
+	}
+
+	c.httpClient, ok = httpClientFromOpts(clientOpts)
+	if !ok {
+		c.httpClient = defaultHTTPClient(dialer, clientOpts.TLSConfig)
+	}
+
+	c.funcCall = c.fnCall
+	c.funcStream = c.fnStream
+
+	return c
+}
+
+func (c *Client) Name() string {
+	return c.opts.Name
+}
+
+func (c *Client) Init(opts ...client.Option) error {
+	for _, o := range opts {
+		o(&c.opts)
+	}
+
+	c.opts.Hooks.EachPrev(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case client.HookCall:
+			c.funcCall = h(c.funcCall)
+		case client.HookStream:
+			c.funcStream = h(c.funcStream)
+		}
+	})
+
+	return nil
+}
+
+func (c *Client) Options() client.Options {
+	return c.opts
+}
+
+func (c *Client) NewRequest(service, method string, req any, opts ...client.RequestOption) client.Request {
+	reqOpts := client.NewRequestOptions(opts...)
+	if reqOpts.ContentType == "" {
+		reqOpts.ContentType = c.opts.ContentType
+	}
+
+	return &httpRequest{
+		service: service,
+		method:  method,
+		request: req,
+		opts:    reqOpts,
+	}
+}
+
+func (c *Client) Call(ctx context.Context, req client.Request, rsp any, opts ...client.CallOption) error {
+	ts := time.Now()
+	c.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Inc()
+	var sp tracer.Span
+	ctx, sp = c.opts.Tracer.Start(ctx, req.Endpoint()+" rpc-client",
+		tracer.WithSpanKind(tracer.SpanKindClient),
+		tracer.WithSpanLabels("endpoint", req.Endpoint()),
+	)
+	err := c.funcCall(ctx, req, rsp, opts...)
+	c.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Dec()
+	te := time.Since(ts)
+	c.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+	c.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+
+	if me := errors.FromError(err); me == nil {
+		sp.Finish()
+		c.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "success", "code", strconv.Itoa(int(200))).Inc()
+	} else {
+		sp.SetStatus(tracer.SpanStatusError, err.Error())
+		c.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "failure", "code", strconv.Itoa(int(me.Code))).Inc()
+	}
+
+	return err
+}
+
+func (c *Client) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
+	return c.funcStream(ctx, req, opts...)
+}
+
+func (c *Client) String() string {
+	return "http"
+}

client_helpers.go

@@ -0,0 +1,263 @@
+package http
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/metadata"
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protoreflect"
+
+	"go.unistack.org/micro-client-http/v4/builder"
+)
+
+func buildHTTPRequest(
+	ctx context.Context,
+	addr string,
+	path string,
+	ct string,
+	cf codec.Codec,
+	msg any,
+	opts client.CallOptions,
+	log logger.Logger,
+) (
+	*http.Request,
+	error,
+) {
+	protoMsg, ok := msg.(proto.Message)
+	if !ok {
+		return nil, errors.New("msg must be a proto message type")
+	}
+
+	var (
+		method  = http.MethodPost
+		bodyOpt string
+
+		parameters = map[string]map[string]string{}
+	)
+
+	if opts.Context != nil {
+		if v, ok := methodFromOpts(opts); ok {
+			method = v
+		}
+		if v, ok := pathFromOpts(opts); ok {
+			path = v
+		}
+		if v, ok := bodyFromOpts(opts); ok {
+			bodyOpt = v
+		}
+		if h, ok := headerFromOpts(opts); ok && len(h) > 0 {
+			m, ok := parameters["header"]
+			if !ok {
+				m = make(map[string]string)
+				parameters["header"] = m
+			}
+			for idx := 0; idx+1 < len(h); idx += 2 {
+				m[h[idx]] = h[idx+1]
+			}
+		}
+		if c, ok := cookieFromOpts(opts); ok && len(c) > 0 {
+			m, ok := parameters["cookie"]
+			if !ok {
+				m = make(map[string]string)
+				parameters["cookie"] = m
+			}
+			for idx := 0; idx+1 < len(c); idx += 2 {
+				m[c[idx]] = c[idx+1]
+			}
+		}
+	}
+
+	reqBuilder, err := builder.NewRequestBuilder(path, method, bodyOpt, protoMsg)
+	if err != nil {
+		return nil, fmt.Errorf("new request builder: %w", err)
+	}
+
+	resolvedPath, newMsg, err := reqBuilder.Build()
+	if err != nil {
+		return nil, fmt.Errorf("build request: %w", err)
+	}
+
+	resolvedURL := joinURL(addr, resolvedPath)
+
+	u, err := normalizeURL(resolvedURL)
+	if err != nil {
+		return nil, fmt.Errorf("normalize url: %w", err)
+	}
+
+	body, err := marshallMsg(cf, newMsg)
+	if err != nil {
+		return nil, fmt.Errorf("marshal msg: %w", err)
+	}
+
+	var hreq *http.Request
+
+	if len(body) > 0 {
+		hreq, err = http.NewRequestWithContext(ctx, method, u.String(), io.NopCloser(bytes.NewBuffer(body)))
+		hreq.ContentLength = int64(len(body))
+	} else {
+		hreq, err = http.NewRequestWithContext(ctx, method, u.String(), nil)
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("new http request: %w", err)
+	}
+
+	setHeadersAndCookies(ctx, hreq, ct, opts)
+	if err = validateHeadersAndCookies(hreq, parameters); err != nil {
+		return nil, fmt.Errorf("validate headers and cookies: %w", err)
+	}
+
+	if log.V(logger.DebugLevel) {
+		log.Debug(
+			ctx,
+			fmt.Sprintf("request %s to %s with headers %v body %s", method, u.String(), hreq.Header, body),
+		)
+	}
+
+	return hreq, nil
+}
+
+func joinURL(addr, resolvedPath string) string {
+	if addr == "" {
+		return resolvedPath
+	}
+	if resolvedPath == "" {
+		return addr
+	}
+
+	switch {
+	case strings.HasSuffix(addr, "/") && strings.HasPrefix(resolvedPath, "/"):
+		return addr + resolvedPath[1:]
+	case !strings.HasSuffix(addr, "/") && !strings.HasPrefix(resolvedPath, "/"):
+		return addr + "/" + resolvedPath
+	default:
+		return addr + resolvedPath
+	}
+}
+
+func normalizeURL(raw string) (*url.URL, error) {
+	if !strings.Contains(raw, "://") {
+		raw = "http://" + raw
+	}
+
+	u, err := url.Parse(raw)
+	if err != nil {
+		return nil, fmt.Errorf("parse url: %w", err)
+	}
+
+	if u.Scheme != "http" && u.Scheme != "https" {
+		return nil, fmt.Errorf("invalid scheme: %q (must be http or https)", u.Scheme)
+	}
+
+	if u.Host == "" {
+		return nil, errors.New("missing host in url")
+	}
+
+	return u, nil
+}
+
+func marshallMsg(cf codec.Codec, msg proto.Message) ([]byte, error) {
+	if msg == nil {
+		return nil, nil
+	}
+	isEmpty := true
+	msg.ProtoReflect().Range(func(protoreflect.FieldDescriptor, protoreflect.Value) bool {
+		isEmpty = false
+		return false
+	})
+	if isEmpty {
+		return nil, nil
+	}
+	return cf.Marshal(msg)
+}
+
+func setHeadersAndCookies(ctx context.Context, r *http.Request, ct string, opts client.CallOptions) {
+	r.Header = make(http.Header)
+
+	r.Header.Set(metadata.HeaderContentType, ct)
+	r.Header.Set("Content-Length", fmt.Sprintf("%d", r.ContentLength))
+
+	if opts.AuthToken != "" {
+		r.Header.Set(metadata.HeaderAuthorization, opts.AuthToken)
+	}
+
+	if opts.StreamTimeout > time.Duration(0) {
+		r.Header.Set(metadata.HeaderTimeout, fmt.Sprintf("%d", opts.StreamTimeout))
+	}
+	if opts.RequestTimeout > time.Duration(0) {
+		r.Header.Set(metadata.HeaderTimeout, fmt.Sprintf("%d", opts.RequestTimeout))
+	}
+
+	if opts.RequestMetadata != nil {
+		for k, v := range opts.RequestMetadata {
+			if k == "Cookie" {
+				applyCookies(r, v)
+				continue
+			}
+			r.Header[k] = append(r.Header[k], v...)
+		}
+	}
+
+	if md, ok := metadata.FromOutgoingContext(ctx); ok {
+		for k, v := range md {
+			if k == "Cookie" {
+				applyCookies(r, v)
+				continue
+			}
+			r.Header[k] = append(r.Header[k], v...)
+		}
+	}
+}
+
+func applyCookies(r *http.Request, rawCookies []string) {
+	if len(rawCookies) == 0 {
+		return
+	}
+
+	raw := strings.Join(rawCookies, "; ")
+
+	tmp := http.Request{Header: http.Header{}}
+	tmp.Header.Set("Cookie", raw)
+
+	for _, c := range tmp.Cookies() {
+		r.AddCookie(c)
+	}
+}
+
+func validateHeadersAndCookies(r *http.Request, parameters map[string]map[string]string) error {
+	if headers, ok := parameters["header"]; ok {
+		for name, required := range headers {
+			if required == "true" && r.Header.Get(name) == "" {
+				return fmt.Errorf("missing required header: %s", name)
+			}
+		}
+	}
+
+	if cookies, ok := parameters["cookie"]; ok {
+		cookieMap := map[string]string{}
+		for _, c := range r.Cookies() {
+			cookieMap[c.Name] = c.Value
+		}
+
+		for name, required := range cookies {
+			if required == "true" {
+				if _, ok := cookieMap[name]; !ok {
+					return fmt.Errorf("missing required cookie: %s", name)
+				}
+			}
+		}
+	}
+
+	return nil
+}

client_helpers_test.go

@@ -0,0 +1,401 @@
+package http
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	jsoncodec "go.unistack.org/micro-codec-json/v4"
+	"google.golang.org/protobuf/proto"
+
+	pb "go.unistack.org/micro-client-http/v4/builder/proto"
+)
+
+func TestJoinURL(t *testing.T) {
+	tests := []struct {
+		name string
+		addr string
+		path string
+		want string
+	}{
+		{
+			name: "both without slash",
+			addr: "http://example.com",
+			path: "api/v1",
+			want: "http://example.com/api/v1",
+		},
+		{
+			name: "addr with slash, path without slash",
+			addr: "http://example.com/",
+			path: "api/v1",
+			want: "http://example.com/api/v1",
+		},
+		{
+			name: "addr without slash, path with slash",
+			addr: "http://example.com",
+			path: "/api/v1",
+			want: "http://example.com/api/v1",
+		},
+		{
+			name: "both with slash",
+			addr: "http://example.com/",
+			path: "/api/v1",
+			want: "http://example.com/api/v1",
+		},
+		{
+			name: "empty addr",
+			addr: "",
+			path: "/api/v1",
+			want: "/api/v1",
+		},
+		{
+			name: "empty path",
+			addr: "http://example.com",
+			path: "",
+			want: "http://example.com",
+		},
+		{
+			name: "both empty",
+			addr: "",
+			path: "",
+			want: "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			require.Equal(t, tt.want, joinURL(tt.addr, tt.path))
+		})
+	}
+}
+
+func TestNormalizeURL(t *testing.T) {
+	tests := []struct {
+		name    string
+		input   string
+		want    string
+		wantErr bool
+	}{
+		{
+			name:    "host with port",
+			input:   "localhost:8080",
+			want:    "http://localhost:8080",
+			wantErr: false,
+		},
+		{
+			name:    "http with host",
+			input:   "http://example.com",
+			want:    "http://example.com",
+			wantErr: false,
+		},
+		{
+			name:    "http with no host",
+			input:   "http://",
+			want:    "",
+			wantErr: true,
+		},
+		{
+			name:    "https with host",
+			input:   "https://example.com",
+			want:    "https://example.com",
+			wantErr: false,
+		},
+		{
+			name:    "https with no host",
+			input:   "https://",
+			want:    "",
+			wantErr: true,
+		},
+		{
+			name:    "invalid scheme",
+			input:   "ftp://example.com",
+			want:    "",
+			wantErr: true,
+		},
+		{
+			name:    "IPv4 without scheme",
+			input:   "127.0.0.1:9000",
+			want:    "http://127.0.0.1:9000",
+			wantErr: false,
+		},
+		{
+			name:    "IPv4 with scheme",
+			input:   "http://127.0.0.1:8080",
+			want:    "http://127.0.0.1:8080",
+			wantErr: false,
+		},
+		{
+			name:    "IPv6 without scheme",
+			input:   "[::1]:8080",
+			want:    "http://[::1]:8080",
+			wantErr: false,
+		},
+		{
+			name:    "IPv6 with scheme",
+			input:   "https://[::1]:443",
+			want:    "https://[::1]:443",
+			wantErr: false,
+		},
+		{
+			name:    "hostname only",
+			input:   "my-service",
+			want:    "http://my-service",
+			wantErr: false,
+		},
+		{
+			name:    "hostname with path",
+			input:   "service.local/api/v1",
+			want:    "http://service.local/api/v1",
+			wantErr: false,
+		},
+		{
+			name:    "hostname with dash and port",
+			input:   "api-service.local:8080",
+			want:    "http://api-service.local:8080",
+			wantErr: false,
+		},
+		{
+			name:    "just path",
+			input:   "/api/v1",
+			want:    "",
+			wantErr: true,
+		},
+		{
+			name:    "empty string",
+			input:   "",
+			want:    "",
+			wantErr: true,
+		},
+		{
+			name:    "http with query params",
+			input:   "http://example.com?x=1&y=2",
+			want:    "http://example.com?x=1&y=2",
+			wantErr: false,
+		},
+		{
+			name:    "http with fragment",
+			input:   "http://example.com/path#section1",
+			want:    "http://example.com/path#section1",
+			wantErr: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result, err := normalizeURL(tt.input)
+			if tt.wantErr {
+				require.Error(t, err)
+				require.Nil(t, result)
+			} else {
+				require.NoError(t, err)
+				require.Equal(t, tt.want, result.String())
+			}
+		})
+	}
+}
+
+func TestMarshallMsg(t *testing.T) {
+	type request = pb.Test_Client_Call_Request
+
+	tests := []struct {
+		name     string
+		msg      proto.Message
+		expected string
+	}{
+		{
+			name:     "empty",
+			msg:      &request{},
+			expected: "",
+		},
+		{
+			name:     "nil",
+			msg:      nil,
+			expected: "",
+		},
+		{
+			name:     "valid",
+			msg:      &request{UserId: "123", OrderId: 456},
+			expected: `{"userId":"123","orderId":456}`,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result, err := marshallMsg(jsoncodec.NewCodec(), tt.msg)
+			require.NoError(t, err)
+			require.Equal(t, tt.expected, string(result))
+		})
+	}
+}
+
+func TestApplyCookies(t *testing.T) {
+	tests := []struct {
+		name       string
+		rawCookies []string
+		want       []*http.Cookie
+	}{
+		{
+			name:       "empty",
+			rawCookies: []string{},
+			want:       []*http.Cookie{},
+		},
+		{
+			name:       "single cookie",
+			rawCookies: []string{"session=abc123"},
+			want: []*http.Cookie{
+				{Name: "session", Value: "abc123"},
+			},
+		},
+		{
+			name:       "multiple cookies separate items",
+			rawCookies: []string{"session=abc123", "user=john"},
+			want: []*http.Cookie{
+				{Name: "session", Value: "abc123"},
+				{Name: "user", Value: "john"},
+			},
+		},
+		{
+			name:       "multiple cookies in one item",
+			rawCookies: []string{"a=1; b=2"},
+			want: []*http.Cookie{
+				{Name: "a", Value: "1"},
+				{Name: "b", Value: "2"},
+			},
+		},
+		{
+			name:       "mix of combined and separate cookies",
+			rawCookies: []string{"a=1; b=2", "c=3"},
+			want: []*http.Cookie{
+				{Name: "a", Value: "1"},
+				{Name: "b", Value: "2"},
+				{Name: "c", Value: "3"},
+			},
+		},
+		{
+			name:       "duplicate cookies",
+			rawCookies: []string{"session=abc123", "session=xyz"},
+			want: []*http.Cookie{
+				{Name: "session", Value: "abc123"},
+				{Name: "session", Value: "xyz"},
+			},
+		},
+		{
+			name:       "cookie with spaces",
+			rawCookies: []string{"token=abc 123"},
+			want: []*http.Cookie{
+				{Name: "token", Value: "abc 123", Quoted: true},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req := httptest.NewRequest("GET", "/", nil)
+			applyCookies(req, tt.rawCookies)
+			require.Equal(t, tt.want, req.Cookies())
+		})
+	}
+}
+
+func TestValidateHeadersAndCookies(t *testing.T) {
+	tests := []struct {
+		name           string
+		prepareRequest func() *http.Request
+		parameters     map[string]map[string]string
+		wantErr        bool
+	}{
+		{
+			name: "all required headers and cookies present",
+			prepareRequest: func() *http.Request {
+				req := httptest.NewRequest("GET", "/", nil)
+				req.Header.Set("My-Header-1", "Header-Value-1")
+				req.Header.Set("My-Header-2", "Header-Value-2")
+				req.AddCookie(&http.Cookie{Name: "session-1", Value: "abc-1"})
+				req.AddCookie(&http.Cookie{Name: "session-2", Value: "abc-2"})
+				return req
+			},
+			parameters: map[string]map[string]string{
+				"header": {"My-Header-1": "true", "My-Header-2": "true"},
+				"cookie": {"session-1": "true", "session-2": "true"},
+			},
+			wantErr: false,
+		},
+		{
+			name: "missing required header",
+			prepareRequest: func() *http.Request {
+				req := httptest.NewRequest("GET", "/", nil)
+				req.Header.Set("My-Header-1", "Header-Value-1")
+				req.AddCookie(&http.Cookie{Name: "session-1", Value: "abc-1"})
+				req.AddCookie(&http.Cookie{Name: "session-2", Value: "abc-2"})
+				return req
+			},
+			parameters: map[string]map[string]string{
+				"header": {"My-Header-1": "true", "My-Header-2": "true"},
+				"cookie": {"session-1": "true", "session-2": "true"},
+			},
+			wantErr: true,
+		},
+		{
+			name: "missing required cookie",
+			prepareRequest: func() *http.Request {
+				req := httptest.NewRequest("GET", "/", nil)
+				req.Header.Set("My-Header-1", "Header-Value-1")
+				req.Header.Set("My-Header-2", "Header-Value-2")
+				req.AddCookie(&http.Cookie{Name: "session-1", Value: "abc-1"})
+				return req
+			},
+			parameters: map[string]map[string]string{
+				"header": {"My-Header-1": "true", "My-Header-2": "true"},
+				"cookie": {"session-1": "true", "session-2": "true"},
+			},
+			wantErr: true,
+		},
+		{
+			name: "optional header and cookie not provided partially",
+			prepareRequest: func() *http.Request {
+				req := httptest.NewRequest("GET", "/", nil)
+				req.Header.Set("My-Header-1", "Header-Value-1")
+				req.AddCookie(&http.Cookie{Name: "session-1", Value: "abc-1"})
+				return req
+			},
+			parameters: map[string]map[string]string{
+				"header": {"My-Header-1": "true", "My-Header-2": "false"},
+				"cookie": {"session-1": "true", "session-2": "false"},
+			},
+			wantErr: false,
+		},
+		{
+			name: "optional header and cookie not provided",
+			prepareRequest: func() *http.Request {
+				req := httptest.NewRequest("GET", "/", nil)
+				return req
+			},
+			parameters: map[string]map[string]string{
+				"header": {"My-Header-1": "false", "My-Header-2": "false"},
+				"cookie": {"session-1": "false", "session-2": "false"},
+			},
+			wantErr: false,
+		},
+		{
+			name: "no headers or cookies required",
+			prepareRequest: func() *http.Request {
+				req := httptest.NewRequest("GET", "/", nil)
+				return req
+			},
+			parameters: map[string]map[string]string{},
+			wantErr:    false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := validateHeadersAndCookies(tt.prepareRequest(), tt.parameters)
+			if tt.wantErr {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}

client_stream.go

@@ -0,0 +1,13 @@
+package http
+
+import (
+	"context"
+
+	"go.unistack.org/micro/v4/client"
+)
+
+// TODO: Add stream support in the future.
+
+func (c *Client) fnStream(context.Context, client.Request, ...client.CallOption) (client.Stream, error) {
+	panic("not implemented")
+}

client_unary_call.go

@@ -0,0 +1,273 @@
+package http
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/errors"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/selector"
+)
+
+func (c *Client) fnCall(ctx context.Context, req client.Request, rsp any, opts ...client.CallOption) error {
+	// make a copy of call opts
+	callOpts := c.opts.CallOptions
+	for _, opt := range opts {
+		opt(&callOpts)
+	}
+
+	// check if we already have a deadline
+	d, ok := ctx.Deadline()
+	if !ok {
+		var cancel context.CancelFunc
+		// no deadline so we create a new one
+		ctx, cancel = context.WithTimeout(ctx, callOpts.RequestTimeout)
+		defer cancel()
+	} else {
+		// got a deadline so no need to setup context,
+		// but we need to set the timeout we pass along
+		opt := client.WithRequestTimeout(time.Until(d))
+		opt(&callOpts)
+	}
+
+	// should we noop right here?
+	select {
+	case <-ctx.Done():
+		return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
+	default:
+	}
+
+	// make copy of call method
+	hcall := c.call
+
+	// use the router passed as a call option, or fallback to the rpc clients router
+	if callOpts.Router == nil {
+		callOpts.Router = c.opts.Router
+	}
+
+	if callOpts.Selector == nil {
+		callOpts.Selector = c.opts.Selector
+	}
+
+	// inject proxy address
+	// TODO: don't even bother using Lookup/Select in this case
+	if len(c.opts.Proxy) > 0 {
+		callOpts.Address = []string{c.opts.Proxy}
+	}
+
+	var next selector.Next
+
+	call := func(i int) error {
+		// call backoff first. Someone may want an initial start delay
+		t, err := callOpts.Backoff(ctx, req, i)
+		if err != nil {
+			return errors.InternalServerError("go.micro.client", "%+v", err)
+		}
+
+		// only sleep if greater than 0
+		if t.Seconds() > 0 {
+			time.Sleep(t)
+		}
+
+		if next == nil {
+			var routes []string
+			// lookup the route to send the reques to
+			// TODO apply any filtering here
+			routes, err = c.opts.Lookup(ctx, req, callOpts)
+			if err != nil {
+				return errors.InternalServerError("go.micro.client", "%+v", err)
+			}
+
+			// balance the list of nodes
+			next, err = callOpts.Selector.Select(routes)
+			if err != nil {
+				return errors.InternalServerError("go.micro.client", "%+v", err)
+			}
+		}
+
+		node := next()
+
+		// make the call
+		err = hcall(ctx, node, req, rsp, callOpts)
+
+		// record the result of the call to inform future routing decisions
+		if verr := c.opts.Selector.Record(node, err); verr != nil {
+			return errors.InternalServerError("go.micro.client", "%+v", verr)
+		}
+
+		// try and transform the error to micro error
+		if verr, ok := err.(*errors.Error); ok {
+			return verr
+		}
+
+		return err
+	}
+
+	ch := make(chan error, callOpts.Retries)
+	var gerr error
+
+	for i := 0; i <= callOpts.Retries; i++ {
+		go func() {
+			ch <- call(i)
+		}()
+
+		select {
+		case <-ctx.Done():
+			return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
+		case err := <-ch:
+			// if the call succeeded lets bail early
+			if err == nil {
+				return nil
+			}
+
+			retry, rerr := callOpts.Retry(ctx, req, i, err)
+			if rerr != nil {
+				return rerr
+			}
+
+			if !retry {
+				return err
+			}
+
+			gerr = err
+		}
+	}
+
+	return gerr
+}
+
+func (c *Client) call(ctx context.Context, addr string, req client.Request, rsp any, opts client.CallOptions) error {
+	ct := req.ContentType()
+	if len(opts.ContentType) > 0 {
+		ct = opts.ContentType
+	}
+
+	cf, err := c.newCodec(ct)
+	if err != nil {
+		return errors.BadRequest("go.micro.client", "%+v", err)
+	}
+
+	hreq, err := buildHTTPRequest(ctx, addr, req.Endpoint(), ct, cf, req.Body(), opts, c.opts.Logger)
+	if err != nil {
+		return errors.BadRequest("go.micro.client", "%+v", err)
+	}
+
+	hrsp, err := c.httpClient.Do(hreq)
+	if err != nil {
+		switch err := err.(type) {
+		case *url.Error:
+			if err, ok := err.Err.(net.Error); ok && err.Timeout() {
+				return errors.Timeout("go.micro.client", "%+v", err)
+			}
+		case net.Error:
+			if err.Timeout() {
+				return errors.Timeout("go.micro.client", "%+v", err)
+			}
+		}
+		return errors.InternalServerError("go.micro.client", "%+v", err)
+	}
+
+	defer hrsp.Body.Close()
+
+	return c.parseRsp(ctx, hrsp, rsp, opts)
+}
+
+func (c *Client) newCodec(ct string) (codec.Codec, error) {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
+	if idx := strings.IndexRune(ct, ';'); idx >= 0 {
+		ct = ct[:idx]
+	}
+
+	if cf, ok := c.opts.Codecs[ct]; ok {
+		return cf, nil
+	}
+
+	return nil, codec.ErrUnknownContentType
+}
+
+func (c *Client) parseRsp(ctx context.Context, hrsp *http.Response, rsp any, opts client.CallOptions) error {
+	log := c.opts.Logger
+
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+
+	var buf []byte
+
+	if opts.ResponseMetadata != nil {
+		for k, v := range hrsp.Header {
+			opts.ResponseMetadata.Set(k, strings.Join(v, ","))
+		}
+	}
+
+	if hrsp.StatusCode == http.StatusNoContent {
+		return nil
+	}
+
+	ct := DefaultContentType
+	if htype := hrsp.Header.Get(metadata.HeaderContentType); htype != "" {
+		ct = htype
+	}
+
+	if hrsp.Body != nil {
+		var err error
+		buf, err = io.ReadAll(hrsp.Body)
+		if err != nil {
+			return errors.InternalServerError("go.micro.client", "read body: %v", err)
+		}
+	}
+
+	cf, err := c.newCodec(ct)
+	if err != nil {
+		return errors.InternalServerError("go.micro.client", "unknown content-type %s: %v", ct, err)
+	}
+
+	if log.V(logger.DebugLevel) {
+		log.Debug(ctx, fmt.Sprintf("response with headers: %v and body: %s", hrsp.Header, buf))
+	}
+
+	if hrsp.StatusCode < http.StatusBadRequest {
+		if err = cf.Unmarshal(buf, rsp); err != nil {
+			return errors.InternalServerError("go.micro.client", "unmarshal response: %v", err)
+		}
+		return nil
+	}
+
+	var mappedErr any
+
+	errMap, ok := errorMapFromOpts(opts)
+	if ok && errMap != nil {
+		mappedErr, ok = errMap[fmt.Sprintf("%d", hrsp.StatusCode)]
+		if !ok {
+			mappedErr, ok = errMap["default"]
+		}
+	}
+
+	if !ok || mappedErr == nil {
+		return errors.New("go.micro.client", string(buf), int32(hrsp.StatusCode))
+	}
+
+	if err = cf.Unmarshal(buf, mappedErr); err != nil {
+		return errors.InternalServerError("go.micro.client", "unmarshal response: %v", err)
+	}
+
+	if v, ok := mappedErr.(error); ok {
+		return v
+	}
+
+	// if the error map item does not implement the error interface, wrap it
+	return &Error{err: mappedErr}
+}

error.go

@@ -0,0 +1,12 @@
+package http
+
+import "fmt"
+
+// Error is used when items in the error map do not implement the error interface and need to be wrapped.
+type Error struct {
+	err any
+}
+
+func (e *Error) Error() string {
+	return fmt.Sprintf("%+v", e.err)
+}

go.mod

@@ -1,5 +1,25 @@
-module go.unistack.org/micro-client-http/v3
+module go.unistack.org/micro-client-http/v4
 
-go 1.16
+go 1.23.0
 
-require go.unistack.org/micro/v3 v3.9.13
+toolchain go1.24.2
+
+require (
+	github.com/stretchr/testify v1.11.1
+	go.unistack.org/micro-codec-json/v4 v4.1.0
+	go.unistack.org/micro/v4 v4.1.19
+	google.golang.org/protobuf v1.36.9
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/matoous/go-nanoid v1.5.1 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/spf13/cast v1.9.2 // indirect
+	go.unistack.org/micro-proto/v4 v4.1.0 // indirect
+	golang.org/x/sys v0.35.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250818200422-3122310a409c // indirect
+	google.golang.org/grpc v1.75.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -1,159 +1,47 @@
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http.go

@@ -1,740 +0,0 @@
-// Package http provides a http client
-package http // import "go.unistack.org/micro-client-http/v3"
-
-import (
-	"bufio"
-	"bytes"
-	"context"
-	"fmt"
-	"io/ioutil"
-	"net"
-	"net/http"
-	"net/url"
-	"os"
-	"strings"
-	"sync"
-	"time"
-
-	"go.unistack.org/micro/v3/broker"
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/errors"
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/selector"
-	rutil "go.unistack.org/micro/v3/util/reflect"
-)
-
-var DefaultContentType = "application/json"
-
-/*
-func filterLabel(r []router.Route) []router.Route {
-	//				selector.FilterLabel("protocol", "http")
-	return r
-}
-*/
-
-type httpClient struct {
-	httpcli *http.Client
-	opts    client.Options
-	sync.RWMutex
-	init bool
-}
-
-func newRequest(ctx context.Context, addr string, req client.Request, ct string, cf codec.Codec, msg interface{}, opts client.CallOptions) (*http.Request, error) {
-	var tags []string
-	var parameters map[string]map[string]string
-	scheme := "http"
-	method := http.MethodPost
-	body := "*" // as like google api http annotation
-	host := addr
-	path := req.Endpoint()
-
-	u, err := url.Parse(addr)
-	if err == nil {
-		scheme = u.Scheme
-		path = u.Path
-		host = u.Host
-	} else {
-		u = &url.URL{Scheme: scheme, Path: path, Host: host}
-	}
-
-	// nolint: nestif
-	if opts.Context != nil {
-		if m, ok := opts.Context.Value(methodKey{}).(string); ok {
-			method = m
-		}
-		if p, ok := opts.Context.Value(pathKey{}).(string); ok {
-			path += p
-		}
-		if b, ok := opts.Context.Value(bodyKey{}).(string); ok {
-			body = b
-		}
-		if t, ok := opts.Context.Value(structTagsKey{}).([]string); ok && len(t) > 0 {
-			tags = t
-		}
-		if k, ok := opts.Context.Value(headerKey{}).([]string); ok && len(k) > 0 {
-			if parameters == nil {
-				parameters = make(map[string]map[string]string)
-			}
-			m, ok := parameters["header"]
-			if !ok {
-				m = make(map[string]string)
-				parameters["header"] = m
-			}
-			for idx := 0; idx < len(k)/2; idx += 2 {
-				m[k[idx]] = k[idx+1]
-			}
-		}
-		if k, ok := opts.Context.Value(cookieKey{}).([]string); ok && len(k) > 0 {
-			if parameters == nil {
-				parameters = make(map[string]map[string]string)
-			}
-			m, ok := parameters["cookie"]
-			if !ok {
-				m = make(map[string]string)
-				parameters["cookie"] = m
-			}
-			for idx := 0; idx < len(k)/2; idx += 2 {
-				m[k[idx]] = k[idx+1]
-			}
-		}
-	}
-
-	if len(tags) == 0 {
-		switch ct {
-		default:
-			tags = append(tags, "json", "protobuf")
-		case "text/xml":
-			tags = append(tags, "xml")
-		}
-	}
-
-	if path == "" {
-		path = req.Endpoint()
-	}
-
-	u, err = u.Parse(path)
-	if err != nil {
-		return nil, errors.BadRequest("go.micro.client", err.Error())
-	}
-
-	var nmsg interface{}
-	if len(u.Query()) > 0 {
-		path, nmsg, err = newPathRequest(u.Path+"?"+u.RawQuery, method, body, msg, tags, parameters)
-	} else {
-		path, nmsg, err = newPathRequest(u.Path, method, body, msg, tags, parameters)
-	}
-
-	if err != nil {
-		return nil, errors.BadRequest("go.micro.client", err.Error())
-	}
-
-	u, err = url.Parse(fmt.Sprintf("%s://%s%s", scheme, host, path))
-	if err != nil {
-		return nil, errors.BadRequest("go.micro.client", err.Error())
-	}
-
-	var cookies []*http.Cookie
-	header := make(http.Header)
-	if opts.Context != nil {
-		if md, ok := opts.Context.Value(metadataKey{}).(metadata.Metadata); ok {
-			for k, v := range md {
-				header.Set(k, v)
-			}
-		}
-	}
-	if opts.AuthToken != "" {
-		header.Set(metadata.HeaderAuthorization, opts.AuthToken)
-	}
-
-	if md, ok := metadata.FromOutgoingContext(ctx); ok {
-		for k, v := range md {
-			header.Set(k, v)
-		}
-	}
-
-	// set timeout in nanoseconds
-	if opts.StreamTimeout > time.Duration(0) {
-		header.Set(metadata.HeaderTimeout, fmt.Sprintf("%d", opts.StreamTimeout))
-	}
-	if opts.RequestTimeout > time.Duration(0) {
-		header.Set(metadata.HeaderTimeout, fmt.Sprintf("%d", opts.RequestTimeout))
-	}
-
-	// set the content type for the request
-	header.Set(metadata.HeaderContentType, ct)
-	var v interface{}
-
-	for km, vm := range parameters {
-		for k, required := range vm {
-			v, err = rutil.StructFieldByPath(msg, k)
-			if err != nil {
-				return nil, errors.BadRequest("go.micro.client", err.Error())
-			}
-			if rutil.IsZero(v) {
-				if required == "true" {
-					return nil, errors.BadRequest("go.micro.client", fmt.Sprintf("required field %s not set", k))
-				}
-				continue
-			}
-
-			switch km {
-			case "header":
-				header.Set(k, fmt.Sprintf("%v", v))
-			case "cookie":
-				cookies = append(cookies, &http.Cookie{Name: k, Value: fmt.Sprintf("%v", v)})
-			}
-		}
-	}
-
-	b, err := cf.Marshal(nmsg)
-	if err != nil {
-		return nil, errors.BadRequest("go.micro.client", err.Error())
-	}
-
-	var hreq *http.Request
-	if len(b) > 0 {
-		hreq, err = http.NewRequestWithContext(ctx, method, u.String(), ioutil.NopCloser(bytes.NewBuffer(b)))
-		hreq.ContentLength = int64(len(b))
-		header.Set("Content-Length", fmt.Sprintf("%d", hreq.ContentLength))
-	} else {
-		hreq, err = http.NewRequestWithContext(ctx, method, u.String(), nil)
-	}
-
-	if err != nil {
-		return nil, errors.BadRequest("go.micro.client", err.Error())
-	}
-
-	hreq.Header = header
-	for _, cookie := range cookies {
-		hreq.AddCookie(cookie)
-	}
-
-	return hreq, nil
-}
-
-func (h *httpClient) call(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions) error {
-	ct := req.ContentType()
-	if len(opts.ContentType) > 0 {
-		ct = opts.ContentType
-	}
-
-	cf, err := h.newCodec(ct)
-	if err != nil {
-		return errors.InternalServerError("go.micro.client", err.Error())
-	}
-	hreq, err := newRequest(ctx, addr, req, ct, cf, req.Body(), opts)
-	if err != nil {
-		return err
-	}
-
-	// make the request
-	hrsp, err := h.httpcli.Do(hreq)
-	if err != nil {
-		switch err := err.(type) {
-		case *url.Error:
-			if err, ok := err.Err.(net.Error); ok && err.Timeout() {
-				return errors.Timeout("go.micro.client", err.Error())
-			}
-		case net.Error:
-			if err.Timeout() {
-				return errors.Timeout("go.micro.client", err.Error())
-			}
-		}
-		return errors.InternalServerError("go.micro.client", err.Error())
-	}
-
-	defer hrsp.Body.Close()
-
-	return h.parseRsp(ctx, hrsp, rsp, opts)
-}
-
-func (h *httpClient) stream(ctx context.Context, addr string, req client.Request, opts client.CallOptions) (client.Stream, error) {
-	ct := req.ContentType()
-	if len(opts.ContentType) > 0 {
-		ct = opts.ContentType
-	}
-
-	// get codec
-	cf, err := h.newCodec(ct)
-	if err != nil {
-		return nil, errors.InternalServerError("go.micro.client", err.Error())
-	}
-
-	cc, err := (h.httpcli.Transport).(*http.Transport).DialContext(ctx, "tcp", addr)
-	if err != nil {
-		return nil, errors.InternalServerError("go.micro.client", fmt.Sprintf("Error dialing: %v", err))
-	}
-
-	return &httpStream{
-		address: addr,
-		context: ctx,
-		closed:  make(chan bool),
-		opts:    opts,
-		conn:    cc,
-		ct:      ct,
-		cf:      cf,
-		reader:  bufio.NewReader(cc),
-		request: req,
-	}, nil
-}
-
-func (h *httpClient) newCodec(ct string) (codec.Codec, error) {
-	h.RLock()
-	defer h.RUnlock()
-
-	if idx := strings.IndexRune(ct, ';'); idx >= 0 {
-		ct = ct[:idx]
-	}
-
-	if c, ok := h.opts.Codecs[ct]; ok {
-		return c, nil
-	}
-
-	return nil, codec.ErrUnknownContentType
-}
-
-func (h *httpClient) Init(opts ...client.Option) error {
-	if len(opts) == 0 && h.init {
-		return nil
-	}
-	for _, o := range opts {
-		o(&h.opts)
-	}
-
-	if err := h.opts.Broker.Init(); err != nil {
-		return err
-	}
-	if err := h.opts.Tracer.Init(); err != nil {
-		return err
-	}
-	if err := h.opts.Router.Init(); err != nil {
-		return err
-	}
-	if err := h.opts.Logger.Init(); err != nil {
-		return err
-	}
-	if err := h.opts.Meter.Init(); err != nil {
-		return err
-	}
-	if err := h.opts.Transport.Init(); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func (h *httpClient) Options() client.Options {
-	return h.opts
-}
-
-func (h *httpClient) NewMessage(topic string, msg interface{}, opts ...client.MessageOption) client.Message {
-	return newHTTPMessage(topic, msg, h.opts.ContentType, opts...)
-}
-
-func (h *httpClient) NewRequest(service, method string, req interface{}, opts ...client.RequestOption) client.Request {
-	return newHTTPRequest(service, method, req, h.opts.ContentType, opts...)
-}
-
-func (h *httpClient) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
-	// make a copy of call opts
-	callOpts := h.opts.CallOptions
-	for _, opt := range opts {
-		opt(&callOpts)
-	}
-
-	// check if we already have a deadline
-	d, ok := ctx.Deadline()
-	if !ok {
-		var cancel context.CancelFunc
-		// no deadline so we create a new one
-		ctx, cancel = context.WithTimeout(ctx, callOpts.RequestTimeout)
-		defer cancel()
-	} else {
-		// got a deadline so no need to setup context
-		// but we need to set the timeout we pass along
-		opt := client.WithRequestTimeout(time.Until(d))
-		opt(&callOpts)
-	}
-
-	// should we noop right here?
-	select {
-	case <-ctx.Done():
-		return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
-	default:
-	}
-
-	// make copy of call method
-	hcall := h.call
-
-	// wrap the call in reverse
-	for i := len(callOpts.CallWrappers); i > 0; i-- {
-		hcall = callOpts.CallWrappers[i-1](hcall)
-	}
-
-	// use the router passed as a call option, or fallback to the rpc clients router
-	if callOpts.Router == nil {
-		callOpts.Router = h.opts.Router
-	}
-
-	if callOpts.Selector == nil {
-		callOpts.Selector = h.opts.Selector
-	}
-
-	// inject proxy address
-	// TODO: don't even bother using Lookup/Select in this case
-	if len(h.opts.Proxy) > 0 {
-		callOpts.Address = []string{h.opts.Proxy}
-	}
-
-	var next selector.Next
-
-	// return errors.New("go.micro.client", "request timeout", 408)
-	call := func(i int) error {
-		// call backoff first. Someone may want an initial start delay
-		t, err := callOpts.Backoff(ctx, req, i)
-		if err != nil {
-			return errors.InternalServerError("go.micro.client", err.Error())
-		}
-
-		// only sleep if greater than 0
-		if t.Seconds() > 0 {
-			time.Sleep(t)
-		}
-
-		if next == nil {
-			var routes []string
-			// lookup the route to send the reques to
-			// TODO apply any filtering here
-			routes, err = h.opts.Lookup(ctx, req, callOpts)
-			if err != nil {
-				return errors.InternalServerError("go.micro.client", err.Error())
-			}
-
-			// balance the list of nodes
-			next, err = callOpts.Selector.Select(routes)
-			if err != nil {
-				return err
-			}
-		}
-
-		node := next()
-
-		// make the call
-		err = hcall(ctx, node, req, rsp, callOpts)
-		// record the result of the call to inform future routing decisions
-		if verr := h.opts.Selector.Record(node, err); verr != nil {
-			return verr
-		}
-
-		// try and transform the error to a go-micro error
-		if verr, ok := err.(*errors.Error); ok {
-			return verr
-		}
-
-		return err
-	}
-
-	ch := make(chan error, callOpts.Retries)
-	var gerr error
-
-	for i := 0; i <= callOpts.Retries; i++ {
-		go func() {
-			ch <- call(i)
-		}()
-
-		select {
-		case <-ctx.Done():
-			return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
-		case err := <-ch:
-			// if the call succeeded lets bail early
-			if err == nil {
-				return nil
-			}
-
-			retry, rerr := callOpts.Retry(ctx, req, i, err)
-			if rerr != nil {
-				return rerr
-			}
-
-			if !retry {
-				return err
-			}
-
-			gerr = err
-		}
-	}
-
-	return gerr
-}
-
-func (h *httpClient) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
-	var err error
-
-	// make a copy of call opts
-	callOpts := h.opts.CallOptions
-	for _, o := range opts {
-		o(&callOpts)
-	}
-
-	// check if we already have a deadline
-	d, ok := ctx.Deadline()
-	if !ok && callOpts.StreamTimeout > time.Duration(0) {
-		var cancel context.CancelFunc
-		// no deadline so we create a new one
-		ctx, cancel = context.WithTimeout(ctx, callOpts.StreamTimeout)
-		defer cancel()
-	} else {
-		// got a deadline so no need to setup context
-		// but we need to set the timeout we pass along
-		o := client.WithStreamTimeout(time.Until(d))
-		o(&callOpts)
-	}
-
-	// should we noop right here?
-	select {
-	case <-ctx.Done():
-		return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
-	default:
-	}
-
-	/*
-		// make copy of call method
-		hstream := h.stream
-		// wrap the call in reverse
-		for i := len(callOpts.CallWrappers); i > 0; i-- {
-			hstream = callOpts.CallWrappers[i-1](hstream)
-		}
-	*/
-
-	// use the router passed as a call option, or fallback to the rpc clients router
-	if callOpts.Router == nil {
-		callOpts.Router = h.opts.Router
-	}
-
-	if callOpts.Selector == nil {
-		callOpts.Selector = h.opts.Selector
-	}
-
-	// inject proxy address
-	// TODO: don't even bother using Lookup/Select in this case
-	if len(h.opts.Proxy) > 0 {
-		callOpts.Address = []string{h.opts.Proxy}
-	}
-
-	var next selector.Next
-
-	call := func(i int) (client.Stream, error) {
-		// call backoff first. Someone may want an initial start delay
-		t, cerr := callOpts.Backoff(ctx, req, i)
-		if cerr != nil {
-			return nil, errors.InternalServerError("go.micro.client", cerr.Error())
-		}
-
-		// only sleep if greater than 0
-		if t.Seconds() > 0 {
-			time.Sleep(t)
-		}
-
-		if next == nil {
-			var routes []string
-			// lookup the route to send the reques to
-			// TODO apply any filtering here
-			routes, err = h.opts.Lookup(ctx, req, callOpts)
-			if err != nil {
-				return nil, errors.InternalServerError("go.micro.client", err.Error())
-			}
-
-			// balance the list of nodes
-			next, err = callOpts.Selector.Select(routes)
-			if err != nil {
-				return nil, err
-			}
-		}
-
-		node := next()
-
-		stream, cerr := h.stream(ctx, node, req, callOpts)
-
-		// record the result of the call to inform future routing decisions
-		if verr := h.opts.Selector.Record(node, cerr); verr != nil {
-			return nil, verr
-		}
-
-		// try and transform the error to a go-micro error
-		if verr, ok := cerr.(*errors.Error); ok {
-			return nil, verr
-		}
-
-		return stream, cerr
-	}
-
-	type response struct {
-		stream client.Stream
-		err    error
-	}
-
-	ch := make(chan response, callOpts.Retries)
-	var grr error
-
-	for i := 0; i <= callOpts.Retries; i++ {
-		go func() {
-			s, cerr := call(i)
-			ch <- response{s, cerr}
-		}()
-
-		select {
-		case <-ctx.Done():
-			return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
-		case rsp := <-ch:
-			// if the call succeeded lets bail early
-			if rsp.err == nil {
-				return rsp.stream, nil
-			}
-
-			retry, rerr := callOpts.Retry(ctx, req, i, err)
-			if rerr != nil {
-				return nil, rerr
-			}
-
-			if !retry {
-				return nil, rsp.err
-			}
-
-			grr = rsp.err
-		}
-	}
-
-	return nil, grr
-}
-
-func (h *httpClient) BatchPublish(ctx context.Context, p []client.Message, opts ...client.PublishOption) error {
-	return h.publish(ctx, p, opts...)
-}
-
-func (h *httpClient) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
-	return h.publish(ctx, []client.Message{p}, opts...)
-}
-
-func (h *httpClient) publish(ctx context.Context, ps []client.Message, opts ...client.PublishOption) error {
-	var body []byte
-
-	options := client.NewPublishOptions(opts...)
-
-	// get proxy
-	exchange := ""
-	if v, ok := os.LookupEnv("MICRO_PROXY"); ok {
-		exchange = v
-	}
-
-	omd, ok := metadata.FromOutgoingContext(ctx)
-	if !ok {
-		omd = metadata.New(2)
-	}
-
-	msgs := make([]*broker.Message, 0, len(ps))
-
-	for _, p := range ps {
-		md := metadata.Copy(omd)
-		md[metadata.HeaderContentType] = p.ContentType()
-
-		// passed in raw data
-		if d, ok := p.Payload().(*codec.Frame); ok {
-			body = d.Data
-		} else {
-			// use codec for payload
-			cf, err := h.newCodec(p.ContentType())
-			if err != nil {
-				return errors.InternalServerError("go.micro.client", err.Error())
-			}
-			// set the body
-			b, err := cf.Marshal(p.Payload())
-			if err != nil {
-				return errors.InternalServerError("go.micro.client", err.Error())
-			}
-			body = b
-		}
-
-		topic := p.Topic()
-		if len(exchange) > 0 {
-			topic = exchange
-		}
-
-		for k, v := range p.Metadata() {
-			md.Set(k, v)
-		}
-		md.Set(metadata.HeaderTopic, topic)
-		msgs = append(msgs, &broker.Message{Header: md, Body: body})
-	}
-
-	return h.opts.Broker.BatchPublish(ctx, msgs,
-		broker.PublishContext(ctx),
-		broker.PublishBodyOnly(options.BodyOnly),
-	)
-}
-
-func (h *httpClient) String() string {
-	return "http"
-}
-
-func (h *httpClient) Name() string {
-	return h.opts.Name
-}
-
-func NewClient(opts ...client.Option) client.Client {
-	options := client.NewOptions(opts...)
-
-	if len(options.ContentType) == 0 {
-		options.ContentType = DefaultContentType
-	}
-
-	rc := &httpClient{
-		opts: options,
-	}
-
-	var dialer func(context.Context, string) (net.Conn, error)
-	if v, ok := options.Context.Value(httpDialerKey{}).(*net.Dialer); ok {
-		dialer = func(ctx context.Context, addr string) (net.Conn, error) {
-			return v.DialContext(ctx, "tcp", addr)
-		}
-	}
-	if options.ContextDialer != nil {
-		dialer = options.ContextDialer
-	}
-	if dialer == nil {
-		dialer = func(ctx context.Context, addr string) (net.Conn, error) {
-			return (&net.Dialer{
-				Timeout:   30 * time.Second,
-				KeepAlive: 30 * time.Second,
-			}).DialContext(ctx, "tcp", addr)
-		}
-	}
-
-	if httpcli, ok := options.Context.Value(httpClientKey{}).(*http.Client); ok {
-		rc.httpcli = httpcli
-	} else {
-		// TODO customTransport := http.DefaultTransport.(*http.Transport).Clone()
-		tr := &http.Transport{
-			Proxy: http.ProxyFromEnvironment,
-			DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
-				return dialer(ctx, addr)
-			},
-			ForceAttemptHTTP2:     true,
-			MaxConnsPerHost:       100,
-			MaxIdleConns:          20,
-			IdleConnTimeout:       60 * time.Second,
-			TLSHandshakeTimeout:   10 * time.Second,
-			ExpectContinueTimeout: 1 * time.Second,
-			TLSClientConfig:       options.TLSConfig,
-		}
-		rc.httpcli = &http.Client{Transport: tr}
-	}
-	c := client.Client(rc)
-
-	// wrap in reverse
-	for i := len(options.Wrappers); i > 0; i-- {
-		c = options.Wrappers[i-1](c)
-	}
-
-	return c
-}

http_test.go

@@ -1,81 +0,0 @@
-package http
-
-import (
-	"net/url"
-	"strings"
-	"testing"
-)
-
-type Request struct {
-	Name     string `json:"name"`
-	Field1   string `json:"field1"`
-	ClientID string
-	Field2   string
-	Field3   int64
-}
-
-func TestPathWithHeader(t *testing.T) {
-	req := &Request{Name: "vtolstov", Field1: "field1", ClientID: "1234567890"}
-	p, m, err := newPathRequest(
-		"/api/v1/test?Name={name}&Field1={field1}",
-		"POST",
-		"*",
-		req,
-		nil,
-		map[string]map[string]string{"header": {"ClientID": "true"}},
-	)
-	if err != nil {
-		t.Fatal(err)
-	}
-	u, err := url.Parse(p)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if m != nil {
-		t.Fatal("new struct must be nil")
-	}
-	if u.Query().Get("Name") != "vtolstov" || u.Query().Get("Field1") != "field1" {
-		t.Fatalf("invalid values %v", u.Query())
-	}
-}
-
-func TestPathValues(t *testing.T) {
-	req := &Request{Name: "vtolstov", Field1: "field1"}
-	p, m, err := newPathRequest("/api/v1/test?Name={name}&Field1={field1}", "POST", "*", req, nil, nil)
-	if err != nil {
-		t.Fatal(err)
-	}
-	u, err := url.Parse(p)
-	if err != nil {
-		t.Fatal(err)
-	}
-	_ = m
-	if u.Query().Get("Name") != "vtolstov" || u.Query().Get("Field1") != "field1" {
-		t.Fatalf("invalid values %v", u.Query())
-	}
-}
-
-func TestValidPath(t *testing.T) {
-	req := &Request{Name: "vtolstov", Field1: "field1", Field2: "field2", Field3: 10}
-	p, m, err := newPathRequest("/api/v1/{name}/list", "GET", "", req, nil, nil)
-	if err != nil {
-		t.Fatal(err)
-	}
-	u, err := url.Parse(p)
-	if err != nil {
-		t.Fatal(err)
-	}
-	_ = m
-	parts := strings.Split(u.RawQuery, "&")
-	if len(parts) != 3 {
-		t.Fatalf("invalid path: %v", parts)
-	}
-}
-
-func TestInvalidPath(t *testing.T) {
-	req := &Request{Name: "vtolstov", Field1: "field1", Field2: "field2", Field3: 10}
-	_, _, err := newPathRequest("/api/v1/{xname}/list", "GET", "", req, nil, nil)
-	if err == nil {
-		t.Fatal("path param must not be filled")
-	}
-}

message.go

@@ -1,44 +0,0 @@
-package http
-
-import (
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/metadata"
-)
-
-type httpMessage struct {
-	payload     interface{}
-	topic       string
-	contentType string
-	opts        client.MessageOptions
-}
-
-func newHTTPMessage(topic string, payload interface{}, contentType string, opts ...client.MessageOption) client.Message {
-	options := client.NewMessageOptions(opts...)
-
-	if len(options.ContentType) > 0 {
-		contentType = options.ContentType
-	}
-
-	return &httpMessage{
-		payload:     payload,
-		topic:       topic,
-		contentType: contentType,
-		opts:        options,
-	}
-}
-
-func (h *httpMessage) ContentType() string {
-	return h.contentType
-}
-
-func (h *httpMessage) Topic() string {
-	return h.topic
-}
-
-func (h *httpMessage) Payload() interface{} {
-	return h.payload
-}
-
-func (h *httpMessage) Metadata() metadata.Metadata {
-	return h.opts.Metadata
-}

options.go

@@ -1,126 +1,148 @@
 package http
 
 import (
+	"context"
+	"crypto/tls"
 	"net"
 	"net/http"
+	"time"
 
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/client"
 )
 
-var (
-	// DefaultPoolMaxStreams maximum streams on a connectioin
-	// (20)
-	DefaultPoolMaxStreams = 20
-
-	// DefaultPoolMaxIdle maximum idle conns of a pool
-	// (50)
-	DefaultPoolMaxIdle = 50
-
-	// DefaultMaxRecvMsgSize maximum message that client can receive
-	// (4 MB).
-	DefaultMaxRecvMsgSize = 1024 * 1024 * 4
-
-	// DefaultMaxSendMsgSize maximum message that client can send
-	// (4 MB).
-	DefaultMaxSendMsgSize = 1024 * 1024 * 4
-)
-
-type poolMaxStreams struct{}
-
-// PoolMaxStreams maximum streams on a connectioin
-func PoolMaxStreams(n int) client.Option {
-	return client.SetOption(poolMaxStreams{}, n)
-}
-
-type poolMaxIdle struct{}
-
-// PoolMaxIdle maximum idle conns of a pool
-func PoolMaxIdle(d int) client.Option {
-	return client.SetOption(poolMaxIdle{}, d)
-}
-
-type maxRecvMsgSizeKey struct{}
-
-// MaxRecvMsgSize set the maximum size of message that client can receive.
-func MaxRecvMsgSize(s int) client.Option {
-	return client.SetOption(maxRecvMsgSizeKey{}, s)
-}
-
-type maxSendMsgSizeKey struct{}
-
-// MaxSendMsgSize set the maximum size of message that client can send.
-func MaxSendMsgSize(s int) client.Option {
-	return client.SetOption(maxSendMsgSizeKey{}, s)
-}
-
+// --------------------------------------------- HTTPClient option -----------------------------------------------------
 type httpClientKey struct{}
 
-// nolint: golint
-// HTTPClient pass http.Client option to client Call
 func HTTPClient(c *http.Client) client.Option {
 	return client.SetOption(httpClientKey{}, c)
 }
 
+func httpClientFromOpts(opts client.Options) (*http.Client, bool) {
+	httpClient, ok := opts.Context.Value(httpClientKey{}).(*http.Client)
+	return httpClient, ok
+}
+
+func defaultHTTPClient(
+	dialer func(ctx context.Context, addr string) (net.Conn, error),
+	tlsConfig *tls.Config,
+) *http.Client {
+	tr := &http.Transport{
+		Proxy: http.ProxyFromEnvironment,
+		DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+			return dialer(ctx, addr)
+		},
+		ForceAttemptHTTP2:     true,
+		MaxConnsPerHost:       100,
+		MaxIdleConns:          20,
+		IdleConnTimeout:       60 * time.Second,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 1 * time.Second,
+		TLSClientConfig:       tlsConfig,
+	}
+	return &http.Client{Transport: tr}
+}
+
+// --------------------------------------------- HTTPDialer option -----------------------------------------------------
 type httpDialerKey struct{}
 
-// nolint: golint
-// HTTPDialer pass net.Dialer option to client
 func HTTPDialer(d *net.Dialer) client.Option {
 	return client.SetOption(httpDialerKey{}, d)
 }
 
+func httpDialerFromOpts(opts client.Options) (dialerFunc func(context.Context, string) (net.Conn, error), ok bool) {
+	var d *net.Dialer
+
+	if d, ok = opts.Context.Value(httpDialerKey{}).(*net.Dialer); ok {
+		dialerFunc = func(ctx context.Context, addr string) (net.Conn, error) {
+			return d.DialContext(ctx, "tcp", addr)
+		}
+	}
+
+	if opts.ContextDialer != nil {
+		dialerFunc, ok = opts.ContextDialer, true
+	}
+
+	return dialerFunc, ok
+}
+
+func defaultHTTPDialer() func(ctx context.Context, addr string) (net.Conn, error) {
+	return func(ctx context.Context, addr string) (net.Conn, error) {
+		d := &net.Dialer{
+			Timeout:   30 * time.Second,
+			KeepAlive: 30 * time.Second,
+		}
+		return d.DialContext(ctx, "tcp", addr)
+	}
+}
+
+// ----------------------------------------------- Method option -------------------------------------------------------
 type methodKey struct{}
 
-// Method pass method option to client Call
 func Method(m string) client.CallOption {
 	return client.SetCallOption(methodKey{}, m)
 }
 
+func methodFromOpts(opts client.CallOptions) (string, bool) {
+	m, ok := opts.Context.Value(methodKey{}).(string)
+	return m, ok
+}
+
+// ------------------------------------------------ Path option --------------------------------------------------------
 type pathKey struct{}
 
-// Path spcecifies path option to client Call
 func Path(p string) client.CallOption {
 	return client.SetCallOption(pathKey{}, p)
 }
 
+func pathFromOpts(opts client.CallOptions) (string, bool) {
+	p, ok := opts.Context.Value(pathKey{}).(string)
+	return p, ok
+}
+
+// ------------------------------------------------ Body option --------------------------------------------------------
 type bodyKey struct{}
 
-// Body specifies body option to client Call
 func Body(b string) client.CallOption {
 	return client.SetCallOption(bodyKey{}, b)
 }
 
+func bodyFromOpts(opts client.CallOptions) (string, bool) {
+	b, ok := opts.Context.Value(bodyKey{}).(string)
+	return b, ok
+}
+
+// ---------------------------------------------- ErrorMap option ------------------------------------------------------
 type errorMapKey struct{}
 
-func ErrorMap(m map[string]interface{}) client.CallOption {
+func ErrorMap(m map[string]any) client.CallOption {
 	return client.SetCallOption(errorMapKey{}, m)
 }
 
-type structTagsKey struct{}
-
-// StructTags pass tags slice option to client Call
-func StructTags(tags []string) client.CallOption {
-	return client.SetCallOption(structTagsKey{}, tags)
-}
-
-type metadataKey struct{}
-
-// Metadata pass metadata to client Call
-func Metadata(md metadata.Metadata) client.CallOption {
-	return client.SetCallOption(metadataKey{}, md)
+func errorMapFromOpts(opts client.CallOptions) (map[string]any, bool) {
+	errMap, ok := opts.Context.Value(errorMapKey{}).(map[string]any)
+	return errMap, ok
 }
 
+// ------------------------------------------------ Cookie option ------------------------------------------------------
 type cookieKey struct{}
 
-// Cookie pass cookie to client Call
 func Cookie(cookies ...string) client.CallOption {
 	return client.SetCallOption(cookieKey{}, cookies)
 }
 
+func cookieFromOpts(opts client.CallOptions) ([]string, bool) {
+	c, ok := opts.Context.Value(cookieKey{}).([]string)
+	return c, ok
+}
+
+// ------------------------------------------------ Header option ------------------------------------------------------
 type headerKey struct{}
 
-// Header pass cookie to client Call
 func Header(headers ...string) client.CallOption {
 	return client.SetCallOption(headerKey{}, headers)
 }
+
+func headerFromOpts(opts client.CallOptions) ([]string, bool) {
+	h, ok := opts.Context.Value(headerKey{}).([]string)
+	return h, ok
+}

request.go

@@ -1,35 +1,15 @@
 package http
 
 import (
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/codec"
 )
 
 type httpRequest struct {
-	service     string
-	method      string
-	contentType string
-	request     interface{}
-	opts        client.RequestOptions
-}
-
-func newHTTPRequest(service, method string, request interface{}, contentType string, opts ...client.RequestOption) client.Request {
-	options := client.NewRequestOptions(opts...)
-	if len(options.ContentType) == 0 {
-		options.ContentType = contentType
-	}
-
-	return &httpRequest{
-		service:     service,
-		method:      method,
-		request:     request,
-		contentType: options.ContentType,
-		opts:        options,
-	}
-}
-
-func (h *httpRequest) ContentType() string {
-	return h.contentType
+	service string
+	method  string
+	request any
+	opts    client.RequestOptions
 }
 
 func (h *httpRequest) Service() string {
@@ -44,14 +24,18 @@ func (h *httpRequest) Endpoint() string {
 	return h.method
 }
 
-func (h *httpRequest) Codec() codec.Codec {
-	return nil
+func (h *httpRequest) ContentType() string {
+	return h.opts.ContentType
 }
 
-func (h *httpRequest) Body() interface{} {
+func (h *httpRequest) Body() any {
 	return h.request
 }
 
+func (h *httpRequest) Codec() codec.Codec {
+	return nil
+}
+
 func (h *httpRequest) Stream() bool {
 	return h.opts.Stream
 }

stream.go

@@ -1,157 +0,0 @@
-package http
-
-import (
-	"bufio"
-	"context"
-	"fmt"
-	"io"
-	"net"
-	"net/http"
-	"sync"
-
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/errors"
-)
-
-// Implements the streamer interface
-type httpStream struct {
-	err     error
-	conn    net.Conn
-	cf      codec.Codec
-	context context.Context
-	request client.Request
-	closed  chan bool
-	reader  *bufio.Reader
-	address string
-	ct      string
-	opts    client.CallOptions
-	sync.RWMutex
-}
-
-var errShutdown = fmt.Errorf("connection is shut down")
-
-func (h *httpStream) isClosed() bool {
-	select {
-	case <-h.closed:
-		return true
-	default:
-		return false
-	}
-}
-
-func (h *httpStream) Context() context.Context {
-	return h.context
-}
-
-func (h *httpStream) Request() client.Request {
-	return h.request
-}
-
-func (h *httpStream) Response() client.Response {
-	return nil
-}
-
-func (h *httpStream) SendMsg(msg interface{}) error {
-	return h.Send(msg)
-}
-
-func (h *httpStream) Send(msg interface{}) error {
-	h.Lock()
-	defer h.Unlock()
-
-	if h.isClosed() {
-		h.err = errShutdown
-		return errShutdown
-	}
-
-	hreq, err := newRequest(h.context, h.address, h.request, h.ct, h.cf, msg, h.opts)
-	if err != nil {
-		return err
-	}
-
-	return hreq.Write(h.conn)
-}
-
-func (h *httpStream) RecvMsg(msg interface{}) error {
-	return h.Recv(msg)
-}
-
-func (h *httpStream) Recv(msg interface{}) error {
-	h.Lock()
-	defer h.Unlock()
-
-	if h.isClosed() {
-		h.err = errShutdown
-		return errShutdown
-	}
-
-	hrsp, err := http.ReadResponse(h.reader, new(http.Request))
-	if err != nil {
-		return errors.InternalServerError("go.micro.client", err.Error())
-	}
-	defer hrsp.Body.Close()
-
-	return h.parseRsp(h.context, hrsp, h.cf, msg, h.opts)
-}
-
-func (h *httpStream) Error() error {
-	h.RLock()
-	defer h.RUnlock()
-	return h.err
-}
-
-func (h *httpStream) CloseSend() error {
-	return h.Close()
-}
-
-func (h *httpStream) Close() error {
-	select {
-	case <-h.closed:
-		return nil
-	default:
-		close(h.closed)
-		return h.conn.Close()
-	}
-}
-
-func (h *httpStream) parseRsp(ctx context.Context, hrsp *http.Response, cf codec.Codec, rsp interface{}, opts client.CallOptions) error {
-	var err error
-
-	select {
-	case <-ctx.Done():
-		err = ctx.Err()
-	default:
-		// fast path return
-		if hrsp.StatusCode == http.StatusNoContent {
-			return nil
-		}
-
-		if hrsp.StatusCode < 400 {
-			if err = cf.ReadBody(hrsp.Body, rsp); err != nil {
-				return errors.InternalServerError("go.micro.client", err.Error())
-			}
-			return nil
-		}
-
-		errmap, ok := opts.Context.Value(errorMapKey{}).(map[string]interface{})
-		if ok && errmap != nil {
-			if err, ok = errmap[fmt.Sprintf("%d", hrsp.StatusCode)].(error); !ok {
-				err, ok = errmap["default"].(error)
-			}
-		}
-		if !ok || err == nil {
-			buf, cerr := io.ReadAll(hrsp.Body)
-			if cerr != nil {
-				return errors.InternalServerError("go.micro.client", cerr.Error())
-			}
-			return errors.New("go.micro.client", string(buf), int32(hrsp.StatusCode))
-		}
-
-		if cerr := cf.ReadBody(hrsp.Body, err); cerr != nil {
-			err = errors.InternalServerError("go.micro.client", cerr.Error())
-		}
-	}
-
-	return err
-}

util.go

@@ -1,343 +0,0 @@
-package http
-
-import (
-	"context"
-	"fmt"
-	"io"
-	"net/http"
-	"net/url"
-	"reflect"
-	"strings"
-	"sync"
-
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/errors"
-	"go.unistack.org/micro/v3/logger"
-	rutil "go.unistack.org/micro/v3/util/reflect"
-)
-
-var (
-	templateCache = make(map[string][]string)
-	mu            sync.RWMutex
-)
-
-// Error struct holds error
-type Error struct {
-	err interface{}
-}
-
-// Error func for error interface
-func (err *Error) Error() string {
-	return fmt.Sprintf("%v", err.err)
-}
-
-func GetError(err error) interface{} {
-	if rerr, ok := err.(*Error); ok {
-		return rerr.err
-	}
-	return err
-}
-
-func newPathRequest(path string, method string, body string, msg interface{}, tags []string, parameters map[string]map[string]string) (string, interface{}, error) {
-	// parse via https://github.com/googleapis/googleapis/blob/master/google/api/http.proto definition
-	tpl, err := newTemplate(path)
-	if err != nil {
-		return "", nil, err
-	}
-
-	if len(tpl) > 0 && msg == nil {
-		return "", nil, fmt.Errorf("nil message but path params requested: %v", path)
-	}
-
-	fieldsmapskip := make(map[string]struct{})
-	fieldsmap := make(map[string]string, len(tpl))
-	for _, v := range tpl {
-		var vs, ve int
-		for i := 0; i < len(v); i++ {
-			switch v[i] {
-			case '{':
-				vs = i + 1
-			case '}':
-				ve = i
-			}
-			if ve != 0 {
-				fieldsmap[v[vs:ve]] = ""
-				vs = 0
-				ve = 0
-			}
-		}
-	}
-
-	nmsg, err := rutil.Zero(msg)
-	if err != nil {
-		return "", nil, err
-	}
-
-	// we cant switch on message and use proto helpers, to avoid dependency to protobuf
-	tmsg := reflect.ValueOf(msg)
-	if tmsg.Kind() == reflect.Ptr {
-		tmsg = tmsg.Elem()
-	}
-
-	tnmsg := reflect.ValueOf(nmsg)
-	if tnmsg.Kind() == reflect.Ptr {
-		tnmsg = tnmsg.Elem()
-	}
-
-	values := url.Values{}
-	// copy cycle
-	for i := 0; i < tmsg.NumField(); i++ {
-		val := tmsg.Field(i)
-		if val.IsZero() {
-			continue
-		}
-		fld := tmsg.Type().Field(i)
-		// Skip unexported fields.
-		if fld.PkgPath != "" {
-			continue
-		}
-		/* check for empty PkgPath can be replaced with new method IsExported
-		if !fld.IsExported() {
-			continue
-		}
-		*/
-		t := &tag{}
-		for _, tn := range tags {
-			ts, ok := fld.Tag.Lookup(tn)
-			if !ok {
-				continue
-			}
-
-			tp := strings.Split(ts, ",")
-			// special
-			switch tn {
-			case "protobuf": // special
-				for _, p := range tp {
-					if idx := strings.Index(p, "name="); idx > 0 {
-						t = &tag{key: tn, name: p[idx:]}
-					}
-				}
-			default:
-				t = &tag{key: tn, name: tp[0]}
-			}
-			if t.name != "" {
-				break
-			}
-		}
-
-		cname := t.name
-		if cname == "" {
-			cname = fld.Name
-			// fallback to lowercase
-			t.name = strings.ToLower(fld.Name)
-		}
-		if _, ok := parameters["header"][cname]; ok {
-			continue
-		}
-		if _, ok := parameters["cookie"][cname]; ok {
-			continue
-		}
-
-		if !val.IsValid() || val.IsZero() {
-			continue
-		}
-
-		// nolint: gocritic, nestif
-		if _, ok := fieldsmap[t.name]; ok {
-			switch val.Type().Kind() {
-			case reflect.Slice:
-				for idx := 0; idx < val.Len(); idx++ {
-					values.Add(t.name, getParam(val.Index(idx)))
-				}
-				fieldsmapskip[t.name] = struct{}{}
-			default:
-				fieldsmap[t.name] = getParam(val)
-			}
-		} else if (body == "*" || body == t.name) && method != http.MethodGet {
-			if tnmsg.Field(i).CanSet() {
-				tnmsg.Field(i).Set(val)
-			}
-		} else {
-			if val.Type().Kind() == reflect.Slice {
-				for idx := 0; idx < val.Len(); idx++ {
-					values.Add(t.name, getParam(val.Index(idx)))
-				}
-			} else {
-				values.Add(t.name, getParam(val))
-			}
-		}
-	}
-
-	// check not filled stuff
-	for k, v := range fieldsmap {
-		_, ok := fieldsmapskip[k]
-		if !ok && v == "" {
-			return "", nil, fmt.Errorf("path param %s not filled", k)
-		}
-	}
-
-	var b strings.Builder
-
-	for _, fld := range tpl {
-		_, _ = b.WriteRune('/')
-		// nolint: nestif
-		var vs, ve, vf int
-		var pholder bool
-		for i := 0; i < len(fld); i++ {
-			switch fld[i] {
-			case '{':
-				vs = i + 1
-			case '}':
-				ve = i
-			}
-			// nolint: nestif
-			if vs > 0 && ve != 0 {
-				if vm, ok := fieldsmap[fld[vs:ve]]; ok {
-					if vm != "" {
-						_, _ = b.WriteString(fld[vf : vs-1])
-						_, _ = b.WriteString(vm)
-						vf = ve + 1
-					}
-				} else {
-					_, _ = b.WriteString(fld)
-				}
-				vs = 0
-				ve = 0
-				pholder = true
-			}
-		}
-		if !pholder {
-			_, _ = b.WriteString(fld)
-		}
-	}
-
-	if len(values) > 0 {
-		_, _ = b.WriteRune('?')
-		_, _ = b.WriteString(values.Encode())
-	}
-
-	if rutil.IsZero(nmsg) {
-		return b.String(), nil, nil
-	}
-
-	return b.String(), nmsg, nil
-}
-
-func newTemplate(path string) ([]string, error) {
-	if len(path) == 0 || path[0] != '/' {
-		return nil, fmt.Errorf("path must starts with /")
-	}
-	mu.RLock()
-	tpl, ok := templateCache[path]
-	if ok {
-		mu.RUnlock()
-		return tpl, nil
-	}
-	mu.RUnlock()
-
-	tpl = strings.Split(path[1:], "/")
-	mu.Lock()
-	templateCache[path] = tpl
-	mu.Unlock()
-
-	return tpl, nil
-}
-
-func (h *httpClient) parseRsp(ctx context.Context, hrsp *http.Response, rsp interface{}, opts client.CallOptions) error {
-	var err error
-
-	select {
-	case <-ctx.Done():
-		err = ctx.Err()
-	default:
-		// fast path return
-		if hrsp.StatusCode == http.StatusNoContent {
-			return nil
-		}
-		ct := DefaultContentType
-
-		if htype := hrsp.Header.Get("Content-Type"); htype != "" {
-			ct = htype
-		}
-
-		cf, cerr := h.newCodec(ct)
-		if hrsp.StatusCode >= 400 && cerr != nil {
-			var buf []byte
-			if hrsp.Body != nil {
-				buf, err = io.ReadAll(hrsp.Body)
-				if err != nil && h.opts.Logger.V(logger.ErrorLevel) {
-					h.opts.Logger.Errorf(ctx, "failed to read body: %v", err)
-				}
-			}
-			// response like text/plain or something else, return original error
-			return errors.New("go.micro.client", string(buf), int32(hrsp.StatusCode))
-		} else if cerr != nil {
-			return errors.InternalServerError("go.micro.client", cerr.Error())
-		}
-
-		// succeseful response
-		if hrsp.StatusCode < 400 {
-			if err = cf.ReadBody(hrsp.Body, rsp); err != nil {
-				return errors.InternalServerError("go.micro.client", err.Error())
-			}
-			return nil
-		}
-
-		// response with error
-		var rerr interface{}
-		errmap, ok := opts.Context.Value(errorMapKey{}).(map[string]interface{})
-		if ok && errmap != nil {
-			rerr, ok = errmap[fmt.Sprintf("%d", hrsp.StatusCode)]
-			if !ok {
-				rerr, ok = errmap["default"]
-			}
-		}
-
-		if !ok || rerr == nil {
-			buf, rerr := io.ReadAll(hrsp.Body)
-			if rerr != nil {
-				return errors.InternalServerError("go.micro.client", rerr.Error())
-			}
-			return errors.New("go.micro.client", string(buf), int32(hrsp.StatusCode))
-		}
-
-		if cerr := cf.ReadBody(hrsp.Body, rerr); cerr != nil {
-			return errors.InternalServerError("go.micro.client", cerr.Error())
-		}
-
-		if err, ok = rerr.(error); !ok {
-			err = &Error{rerr}
-		}
-
-	}
-
-	return err
-}
-
-type tag struct {
-	key  string
-	name string
-}
-
-func getParam(val reflect.Value) string {
-	var v string
-	switch val.Kind() {
-	case reflect.Ptr:
-		switch reflect.Indirect(val).Type().String() {
-		case
-			"wrapperspb.BoolValue",
-			"wrapperspb.BytesValue",
-			"wrapperspb.DoubleValue",
-			"wrapperspb.FloatValue",
-			"wrapperspb.Int32Value", "wrapperspb.Int64Value",
-			"wrapperspb.StringValue",
-			"wrapperspb.UInt32Value", "wrapperspb.UInt64Value":
-			if eva := reflect.Indirect(val).FieldByName("Value"); eva.IsValid() {
-				v = getParam(eva)
-			}
-		}
-	default:
-		v = fmt.Sprintf("%v", val.Interface())
-	}
-	return v
-}

util_test.go

@@ -1,99 +0,0 @@
-package http
-
-import (
-	"net/url"
-	"testing"
-)
-
-func TestParsing(t *testing.T) {
-	type Message struct {
-		IIN string `protobuf:"bytes,1,opt,name=iin,proto3" json:"iin"`
-	}
-
-	omsg := &Message{IIN: "5555"}
-
-	for _, m := range []string{"POST"} {
-		body := ""
-		path, nmsg, err := newPathRequest("/users/iin/{iin}/push-notifications", m, body, omsg, []string{"protobuf", "json"}, nil)
-		if err != nil {
-			t.Fatal(err)
-		}
-		u, err := url.Parse(path)
-		if err != nil {
-			t.Fatal(err)
-		}
-		_ = nmsg
-		if u.Path != "/users/iin/5555/push-notifications" {
-			t.Fatalf("newPathRequest invalid path %s", u.Path)
-		}
-		if nmsg != nil {
-			t.Fatalf("new message must be nil: %v\n", nmsg)
-		}
-	}
-}
-
-func TestNewPathRequest(t *testing.T) {
-	type Message struct {
-		Name string `json:"name"`
-		Val1 string `protobuf:"bytes,1,opt,name=val1,proto3" json:"val1"`
-		Val3 []string
-		Val2 int64
-	}
-
-	omsg := &Message{Name: "test_name", Val1: "test_val1", Val2: 100, Val3: []string{"slice"}}
-
-	for _, m := range []string{"POST", "PUT", "PATCH", "GET", "DELETE"} {
-		body := ""
-		path, nmsg, err := newPathRequest("/v1/test", m, body, omsg, []string{"protobuf", "json"}, nil)
-		if err != nil {
-			t.Fatal(err)
-		}
-		u, err := url.Parse(path)
-		if err != nil {
-			t.Fatal(err)
-		}
-		vals := u.Query()
-		if v, ok := vals["name"]; !ok || v[0] != "test_name" {
-			t.Fatalf("invalid path: %v nmsg: %v", path, nmsg)
-		}
-	}
-}
-
-func TestNewPathVarRequest(t *testing.T) {
-	type Message struct {
-		Name string `json:"name"`
-		Val1 string `protobuf:"bytes,1,opt,name=val1,proto3" json:"val1"`
-		Val3 []string
-		Val2 int64
-	}
-
-	omsg := &Message{Name: "test_name", Val1: "test_val1", Val2: 100, Val3: []string{"slice"}}
-
-	for _, m := range []string{"POST", "PUT", "PATCH", "GET", "DELETE"} {
-		body := ""
-		if m != "GET" {
-			body = "*"
-		}
-		path, nmsg, err := newPathRequest("/v1/test/{val1}", m, body, omsg, []string{"protobuf", "json"}, nil)
-		if err != nil {
-			t.Fatal(err)
-		}
-		u, err := url.Parse(path)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if m != "GET" {
-			if _, ok := nmsg.(*Message); !ok {
-				t.Fatalf("invalid nmsg: %#+v\n", nmsg)
-			}
-			if nmsg.(*Message).Name != "test_name" {
-				t.Fatalf("invalid nmsg: %v nmsg: %v", path, nmsg)
-			}
-		} else {
-			vals := u.Query()
-			if v, ok := vals["val2"]; !ok || v[0] != "100" {
-				t.Fatalf("invalid path: %v nmsg: %v", path, nmsg)
-			}
-		}
-	}
-}