Apply Code Coverage Badge

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

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,18 @@
+---
+name: Bug report
+about: For reporting bugs in micro
+title: "[BUG]"
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+
+1. What are you trying to do?
+2. What did you expect to happen?
+3. What happens instead?
+
+**How to reproduce the bug:**
+
+If possible, please include a minimal code snippet here.

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

@@ -0,0 +1,17 @@
+---
+name: Feature request / Enhancement
+about: If you have a need not served by micro
+title: "[FEATURE]"
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,8 @@
+---
+name: Question
+about: Ask a question about micro
+title: ''
+labels: ''
+assignees: ''
+
+---

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,9 @@
+## Pull Request template
+Please, go through these steps before clicking submit on this PR.
+
+1. Give a descriptive title to your PR.
+2. Provide a description of your changes.
+3. Make sure you have some relevant tests.
+4. Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes (if applicable).
+
+**PLEASE REMOVE THIS TEMPLATE BEFORE SUBMITTING**

.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/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

.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

@@ -0,0 +1,5 @@
+run:
+  concurrency: 8
+  timeout: 5m
+  issues-exit-code: 1
+  tests: true

.synced

@@ -0,0 +1 @@
+7e753b1f84b06797ce8c4be8e4b1941b45f8bbb7

LICENSE

@@ -0,0 +1,192 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
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+      other entities that control, are controlled by, or are under common
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+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
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+      including but not limited to software source code, documentation
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+
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+      copyright notice that is included in or attached to the work
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+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
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+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
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+      designated in writing by the copyright owner as "Not a Contribution."
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+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
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+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
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+      (except as stated in this section) patent license to make, have made,
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+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
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+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
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+      (d) If the Work includes a "NOTICE" text file as part of its
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+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
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+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   Copyright 2015-2020 Asim Aslam.
+   Copyright 2019-2020 Unistack LLC.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

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 go-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 go-micro client with service discovery, load balancing and streaming.
+The HTTP client wraps `net/http` to provide a robust client with service discovery, load balancing and 
-It complies with the [go-micro.Client](https://godoc.org/github.com/micro/go-micro/client#Client) interface.
+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 "github.com/micro/go-plugins/client/http"
+import (
+    "go.unistack.org/micro/v4"
+    http "go.unistack.org/micro-client-http/v4"
+)
 
 service := micro.NewService(
 	micro.Name("my.service"),
@@ -20,42 +28,127 @@ service := micro.NewService(
 )
 ```
 
-### Use with flags
+### Simple call
 
 ```go
-import _ "github.com/micro/go-plugins/client/http"
+import (
+    "go.unistack.org/micro/v4/client"
+    http "go.unistack.org/micro-client-http/v4"
+    jsoncodec "go.unistack.org/micro-codec-json/v4"
+)
+
+c := http.NewClient(
+    client.Codec("application/json", jsoncodec.NewCodec()),
+)
+
+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"),
+)
 ```
 
-```shell
+### Call with specific options
-go run main.go --client=http
-```
 
-### Call Service
-
-Assuming you have a http service "my.service" with path "/foo/bar"
 ```go
-// new client
+import (
-client := http.NewClient()
+    "go.unistack.org/micro/v4/client"
+    http "go.unistack.org/micro-client-http/v4"
+)
 
-// create request/response
+err := c.Call(
-request := client.NewRequest("my.service", "/foo/bar", protoRequest{})
+    ctx,
-response := new(protoResponse)
+    req,
-
+    rsp,
-// call service
+    client.WithAddress("example.com"),
-err := client.Call(context.TODO(), request, response)
+    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
+    }),
+)
+```

buffer.go

@@ -1,14 +0,0 @@
-package http
-
-import (
-	"bytes"
-)
-
-type buffer struct {
-	*bytes.Buffer
-}
-
-func (b *buffer) Close() error {
-	b.Buffer.Reset()
-	return nil
-}

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}
+}

codec.go

@@ -1,61 +0,0 @@
-package http
-
-import (
-	"encoding/json"
-
-	"github.com/golang/protobuf/proto"
-	"github.com/micro/go-micro/v2/codec"
-	"github.com/micro/go-micro/v2/codec/jsonrpc"
-	"github.com/micro/go-micro/v2/codec/protorpc"
-)
-
-type jsonCodec struct{}
-
-type protoCodec struct{}
-
-type Codec interface {
-	Marshal(v interface{}) ([]byte, error)
-	Unmarshal(b []byte, v interface{}) error
-	String() string
-}
-
-var (
-	defaultHTTPCodecs = map[string]Codec{
-		"application/json":         jsonCodec{},
-		"application/proto":        protoCodec{},
-		"application/protobuf":     protoCodec{},
-		"application/octet-stream": protoCodec{},
-	}
-
-	defaultRPCCodecs = map[string]codec.NewCodec{
-		"application/json":         jsonrpc.NewCodec,
-		"application/json-rpc":     jsonrpc.NewCodec,
-		"application/protobuf":     protorpc.NewCodec,
-		"application/proto-rpc":    protorpc.NewCodec,
-		"application/octet-stream": protorpc.NewCodec,
-	}
-)
-
-func (protoCodec) Marshal(v interface{}) ([]byte, error) {
-	return proto.Marshal(v.(proto.Message))
-}
-
-func (protoCodec) Unmarshal(data []byte, v interface{}) error {
-	return proto.Unmarshal(data, v.(proto.Message))
-}
-
-func (protoCodec) String() string {
-	return "proto"
-}
-
-func (jsonCodec) Marshal(v interface{}) ([]byte, error) {
-	return json.Marshal(v)
-}
-
-func (jsonCodec) Unmarshal(data []byte, v interface{}) error {
-	return json.Unmarshal(data, v)
-}
-
-func (jsonCodec) String() string {
-	return "json"
-}

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

@@ -1,10 +1,25 @@
-module github.com/micro/go-plugins/client/http/v2
+module go.unistack.org/micro-client-http/v4
 
-go 1.13
+go 1.23.0
+
+toolchain go1.24.2
 
 require (
-	github.com/golang/protobuf v1.4.0
+	github.com/stretchr/testify v1.11.1
-	github.com/micro/go-micro/v2 v2.9.1-0.20200716153311-f9bf56239306
+	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
 )
 
-replace github.com/coreos/etcd => github.com/ozonru/etcd v3.3.20-grpc1.27-origmodule+incompatible
+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

@@ -1,668 +1,47 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
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http.go

@@ -1,506 +0,0 @@
-// Package http provides a http client
-package http
-
-import (
-	"bufio"
-	"bytes"
-	"context"
-	"fmt"
-	"io/ioutil"
-	"net"
-	"net/http"
-	"net/url"
-	"os"
-	"sync"
-	"time"
-
-	"github.com/micro/go-micro/v2/broker"
-	"github.com/micro/go-micro/v2/client"
-	"github.com/micro/go-micro/v2/cmd"
-	"github.com/micro/go-micro/v2/codec"
-	raw "github.com/micro/go-micro/v2/codec/bytes"
-	errors "github.com/micro/go-micro/v2/errors"
-	"github.com/micro/go-micro/v2/metadata"
-	"github.com/micro/go-micro/v2/registry"
-	"github.com/micro/go-micro/v2/router"
-	"github.com/micro/go-micro/v2/selector"
-	"github.com/micro/go-micro/v2/transport"
-)
-
-func filterLabel(r []router.Route) []router.Route {
-	//				selector.FilterLabel("protocol", "http")
-	return r
-}
-
-type httpClient struct {
-	once sync.Once
-	opts client.Options
-}
-
-func init() {
-	cmd.DefaultClients["http"] = NewClient
-}
-
-func (h *httpClient) call(ctx context.Context, node *registry.Node, req client.Request, rsp interface{}, opts client.CallOptions) error {
-	// set the address
-	address := node.Address
-	header := make(http.Header)
-	if md, ok := metadata.FromContext(ctx); ok {
-		for k, v := range md {
-			header.Set(k, v)
-		}
-	}
-
-	// set timeout in nanoseconds
-	header.Set("Timeout", fmt.Sprintf("%d", opts.RequestTimeout))
-	// set the content type for the request
-	header.Set("Content-Type", req.ContentType())
-
-	// get codec
-	cf, err := h.newHTTPCodec(req.ContentType())
-	if err != nil {
-		return errors.InternalServerError("go.micro.client", err.Error())
-	}
-
-	// marshal request
-	b, err := cf.Marshal(req.Body())
-	if err != nil {
-		return errors.InternalServerError("go.micro.client", err.Error())
-	}
-
-	buf := &buffer{bytes.NewBuffer(b)}
-	defer buf.Close()
-
-	hreq := &http.Request{
-		Method: "POST",
-		URL: &url.URL{
-			Scheme: "http",
-			Host:   address,
-			Path:   req.Endpoint(),
-		},
-		Header:        header,
-		Body:          buf,
-		ContentLength: int64(len(b)),
-		Host:          address,
-	}
-
-	// make the request
-	hrsp, err := http.DefaultClient.Do(hreq.WithContext(ctx))
-	if err != nil {
-		return errors.InternalServerError("go.micro.client", err.Error())
-	}
-	defer hrsp.Body.Close()
-
-	// parse response
-	b, err = ioutil.ReadAll(hrsp.Body)
-	if err != nil {
-		return errors.InternalServerError("go.micro.client", err.Error())
-	}
-
-	// unmarshal
-	if err := cf.Unmarshal(b, rsp); err != nil {
-		return errors.InternalServerError("go.micro.client", err.Error())
-	}
-
-	return nil
-}
-
-func (h *httpClient) stream(ctx context.Context, node *registry.Node, req client.Request, opts client.CallOptions) (client.Stream, error) {
-	// set the address
-	address := node.Address
-	header := make(http.Header)
-	if md, ok := metadata.FromContext(ctx); ok {
-		for k, v := range md {
-			header.Set(k, v)
-		}
-	}
-
-	// set timeout in nanoseconds
-	header.Set("Timeout", fmt.Sprintf("%d", opts.RequestTimeout))
-	// set the content type for the request
-	header.Set("Content-Type", req.ContentType())
-
-	// get codec
-	cf, err := h.newHTTPCodec(req.ContentType())
-	if err != nil {
-		return nil, errors.InternalServerError("go.micro.client", err.Error())
-	}
-
-	cc, err := net.Dial("tcp", address)
-	if err != nil {
-		return nil, errors.InternalServerError("go.micro.client", fmt.Sprintf("Error dialing: %v", err))
-	}
-
-	return &httpStream{
-		address: address,
-		context: ctx,
-		closed:  make(chan bool),
-		conn:    cc,
-		codec:   cf,
-		header:  header,
-		reader:  bufio.NewReader(cc),
-		request: req,
-	}, nil
-}
-
-func (h *httpClient) newHTTPCodec(contentType string) (Codec, error) {
-	if c, ok := defaultHTTPCodecs[contentType]; ok {
-		return c, nil
-	}
-	return nil, fmt.Errorf("Unsupported Content-Type: %s", contentType)
-}
-
-func (h *httpClient) newCodec(contentType string) (codec.NewCodec, error) {
-	if c, ok := h.opts.Codecs[contentType]; ok {
-		return c, nil
-	}
-	if cf, ok := defaultRPCCodecs[contentType]; ok {
-		return cf, nil
-	}
-	return nil, fmt.Errorf("Unsupported Content-Type: %s", contentType)
-}
-
-func (h *httpClient) Init(opts ...client.Option) error {
-	for _, o := range opts {
-		o(&h.opts)
-	}
-	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, "application/proto", opts...)
-}
-
-func (h *httpClient) NewRequest(service, method string, req interface{}, reqOpts ...client.RequestOption) client.Request {
-	return newHTTPRequest(service, method, req, h.opts.ContentType, reqOpts...)
-}
-
-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 {
-		// no deadline so we create a new one
-		ctx, _ = context.WithTimeout(ctx, callOpts.RequestTimeout)
-	} else {
-		// got a deadline so no need to setup context
-		// but we need to set the timeout we pass along
-		opt := client.WithRequestTimeout(d.Sub(time.Now()))
-		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)
-	}
-
-	// 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)
-		}
-
-		// use the router passed as a call option, or fallback to the rpc clients router
-		if callOpts.Router == nil {
-			callOpts.Router = h.opts.Router
-		}
-		// use the selector passed as a call option, or fallback to the rpc clients selector
-		if callOpts.Selector == nil {
-			callOpts.Selector = h.opts.Selector
-		}
-
-		callOpts.SelectOptions = append(callOpts.SelectOptions, selector.WithFilter(filterLabel))
-
-		// lookup the route to send the request via
-		route, err := client.LookupRoute(req, callOpts)
-		if err != nil {
-			return err
-		}
-
-		// pass a node to enable backwards compatability as changing the
-		// call func would be a breaking change.
-		// todo v3: change the call func to accept a route
-		node := &registry.Node{Address: route.Address, Metadata: route.Metadata}
-		node.Metadata["protocol"] = "http"
-
-		// make the call
-		err = hcall(ctx, node, req, rsp, callOpts)
-		h.opts.Selector.Record(*route, err)
-
-		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) {
-	// 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 {
-		// no deadline so we create a new one
-		ctx, _ = context.WithTimeout(ctx, callOpts.RequestTimeout)
-	} else {
-		// got a deadline so no need to setup context
-		// but we need to set the timeout we pass along
-		opt := client.WithRequestTimeout(d.Sub(time.Now()))
-		opt(&callOpts)
-	}
-
-	// should we noop right here?
-	select {
-	case <-ctx.Done():
-		return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
-	default:
-	}
-
-	call := func(i int) (client.Stream, error) {
-		// call backoff first. Someone may want an initial start delay
-		t, err := callOpts.Backoff(ctx, req, i)
-		if err != nil {
-			return nil, errors.InternalServerError("go.micro.client", err.Error())
-		}
-
-		// only sleep if greater than 0
-		if t.Seconds() > 0 {
-			time.Sleep(t)
-		}
-
-		// use the router passed as a call option, or fallback to the rpc clients router
-		if callOpts.Router == nil {
-			callOpts.Router = h.opts.Router
-		}
-		// use the selector passed as a call option, or fallback to the rpc clients selector
-		if callOpts.Selector == nil {
-			callOpts.Selector = h.opts.Selector
-		}
-
-		callOpts.SelectOptions = append(callOpts.SelectOptions, selector.WithFilter(filterLabel))
-
-		// lookup the route to send the request via
-		route, err := client.LookupRoute(req, callOpts)
-		if err != nil {
-			return nil, err
-		}
-
-		// pass a node to enable backwards compatability as changing the
-		// call func would be a breaking change.
-		// todo v3: change the call func to accept a route
-		node := &registry.Node{Address: route.Address, Metadata: route.Metadata}
-		node.Metadata["protocol"] = "http"
-
-		stream, err := h.stream(ctx, node, req, callOpts)
-		h.opts.Selector.Record(*route, err)
-
-		return stream, err
-	}
-
-	type response struct {
-		stream client.Stream
-		err    error
-	}
-
-	ch := make(chan response, callOpts.Retries)
-	var grr error
-	var err error
-
-	for i := 0; i < callOpts.Retries; i++ {
-		go func() {
-			s, err := call(i)
-			ch <- response{s, err}
-		}()
-
-		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) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
-	options := client.PublishOptions{
-		Context: context.Background(),
-	}
-	for _, o := range opts {
-		o(&options)
-	}
-
-	md, ok := metadata.FromContext(ctx)
-	if !ok {
-		md = make(map[string]string)
-	}
-	md["Content-Type"] = p.ContentType()
-	md["Micro-Topic"] = p.Topic()
-
-	cf, err := h.newCodec(p.ContentType())
-	if err != nil {
-		return errors.InternalServerError("go.micro.client", err.Error())
-	}
-
-	var body []byte
-
-	// passed in raw data
-	if d, ok := p.Payload().(*raw.Frame); ok {
-		body = d.Data
-	} else {
-		b := &buffer{bytes.NewBuffer(nil)}
-		if err := cf(b).Write(&codec.Message{Type: codec.Event}, p.Payload()); err != nil {
-			return errors.InternalServerError("go.micro.client", err.Error())
-		}
-		body = b.Bytes()
-	}
-
-	h.once.Do(func() {
-		h.opts.Broker.Connect()
-	})
-
-	topic := p.Topic()
-
-	// get proxy
-	if prx := os.Getenv("MICRO_PROXY"); len(prx) > 0 {
-		options.Exchange = prx
-	}
-
-	// get the exchange
-	if len(options.Exchange) > 0 {
-		topic = options.Exchange
-	}
-
-	return h.opts.Broker.Publish(topic, &broker.Message{
-		Header: md,
-		Body:   body,
-	})
-}
-
-func (h *httpClient) String() string {
-	return "http"
-}
-
-func newClient(opts ...client.Option) client.Client {
-	options := client.Options{
-		CallOptions: client.CallOptions{
-			Backoff:        client.DefaultBackoff,
-			Retry:          client.DefaultRetry,
-			Retries:        client.DefaultRetries,
-			RequestTimeout: client.DefaultRequestTimeout,
-			DialTimeout:    transport.DefaultDialTimeout,
-		},
-	}
-
-	for _, o := range opts {
-		o(&options)
-	}
-
-	if len(options.ContentType) == 0 {
-		options.ContentType = "application/proto"
-	}
-
-	if options.Broker == nil {
-		options.Broker = broker.DefaultBroker
-	}
-
-	if options.Router == nil {
-		options.Router = router.DefaultRouter
-	}
-
-	if options.Selector == nil {
-		options.Selector = selector.DefaultSelector
-	}
-
-	rc := &httpClient{
-		once: sync.Once{},
-		opts: options,
-	}
-
-	c := client.Client(rc)
-
-	// wrap in reverse
-	for i := len(options.Wrappers); i > 0; i-- {
-		c = options.Wrappers[i-1](c)
-	}
-
-	return c
-}
-
-func NewClient(opts ...client.Option) client.Client {
-	return newClient(opts...)
-}

http_test.go

@@ -1,271 +0,0 @@
-package http
-
-import (
-	"bufio"
-	"bytes"
-	"context"
-	"fmt"
-	"io/ioutil"
-	"net"
-	"net/http"
-	"testing"
-
-	"github.com/micro/go-micro/v2/client"
-	"github.com/micro/go-micro/v2/registry"
-	"github.com/micro/go-micro/v2/registry/memory"
-	"github.com/micro/go-micro/v2/router"
-	rrouter "github.com/micro/go-micro/v2/router/registry"
-	"github.com/micro/go-plugins/client/http/v2/test"
-)
-
-func TestHTTPClient(t *testing.T) {
-	r := memory.NewRegistry()
-	s := rrouter.NewRouter(router.Registry(r))
-
-	l, err := net.Listen("tcp", "127.0.0.1:0")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer l.Close()
-
-	mux := http.NewServeMux()
-	mux.HandleFunc("/foo/bar", func(w http.ResponseWriter, r *http.Request) {
-		// only accept post
-		if r.Method != "POST" {
-			http.Error(w, "expect post method", 500)
-			return
-		}
-
-		// get codec
-		ct := r.Header.Get("Content-Type")
-		codec, ok := defaultHTTPCodecs[ct]
-		if !ok {
-			http.Error(w, "codec not found", 500)
-			return
-		}
-		b, err := ioutil.ReadAll(r.Body)
-		if err != nil {
-			http.Error(w, err.Error(), 500)
-			return
-		}
-
-		// extract message
-		msg := new(test.Message)
-		if err := codec.Unmarshal(b, msg); err != nil {
-			http.Error(w, err.Error(), 500)
-			return
-		}
-
-		// marshal response
-		b, err = codec.Marshal(msg)
-		if err != nil {
-			http.Error(w, err.Error(), 500)
-			return
-		}
-
-		// write response
-		w.Write(b)
-	})
-	go http.Serve(l, mux)
-
-	if err := r.Register(&registry.Service{
-		Name: "test.service",
-		Nodes: []*registry.Node{
-			{
-				Id:      "test.service.1",
-				Address: l.Addr().String(),
-				Metadata: map[string]string{
-					"protocol": "http",
-				},
-			},
-		},
-	}); err != nil {
-		t.Fatal(err)
-	}
-
-	c := NewClient(client.Router(s))
-
-	for i := 0; i < 10; i++ {
-		msg := &test.Message{
-			Seq:  int64(i),
-			Data: fmt.Sprintf("message %d", i),
-		}
-		req := c.NewRequest("test.service", "/foo/bar", msg)
-		rsp := new(test.Message)
-		err := c.Call(context.TODO(), req, rsp)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if rsp.Seq != msg.Seq {
-			t.Fatalf("invalid seq %d for %d", rsp.Seq, msg.Seq)
-		}
-	}
-}
-
-func TestHTTPClientStream(t *testing.T) {
-	r := memory.NewRegistry()
-	s := rrouter.NewRouter(router.Registry(r))
-
-	l, err := net.Listen("tcp", "127.0.0.1:0")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer l.Close()
-
-	mux := http.NewServeMux()
-	mux.HandleFunc("/foo/bar", func(w http.ResponseWriter, r *http.Request) {
-		// only accept post
-		if r.Method != "POST" {
-			http.Error(w, "expect post method", 500)
-			return
-		}
-
-		// hijack the connection
-		hj, ok := w.(http.Hijacker)
-		if !ok {
-			http.Error(w, "could not hijack conn", 500)
-			return
-
-		}
-
-		// hijacked
-		conn, bufrw, err := hj.Hijack()
-		if err != nil {
-			http.Error(w, err.Error(), 500)
-			return
-		}
-		defer conn.Close()
-
-		// read off the first request
-		// get codec
-		ct := r.Header.Get("Content-Type")
-		codec, ok := defaultHTTPCodecs[ct]
-		if !ok {
-			http.Error(w, "codec not found", 500)
-			return
-		}
-		b, err := ioutil.ReadAll(r.Body)
-		if err != nil {
-			http.Error(w, err.Error(), 500)
-			return
-		}
-
-		// extract message
-		msg := new(test.Message)
-		if err := codec.Unmarshal(b, msg); err != nil {
-			http.Error(w, err.Error(), 500)
-			return
-		}
-
-		// marshal response
-		b, err = codec.Marshal(msg)
-		if err != nil {
-			http.Error(w, err.Error(), 500)
-			return
-		}
-
-		// write response
-		rsp := &http.Response{
-			Header:        r.Header,
-			Body:          &buffer{bytes.NewBuffer(b)},
-			Status:        "200 OK",
-			StatusCode:    200,
-			Proto:         "HTTP/1.1",
-			ProtoMajor:    1,
-			ProtoMinor:    1,
-			ContentLength: int64(len(b)),
-		}
-
-		// write response
-		rsp.Write(bufrw)
-		bufrw.Flush()
-
-		reader := bufio.NewReader(conn)
-
-		for {
-			r, err := http.ReadRequest(reader)
-			if err != nil {
-				http.Error(w, err.Error(), 500)
-				return
-			}
-
-			b, err = ioutil.ReadAll(r.Body)
-			if err != nil {
-				http.Error(w, err.Error(), 500)
-				return
-			}
-
-			// extract message
-			msg := new(test.Message)
-			if err := codec.Unmarshal(b, msg); err != nil {
-				http.Error(w, err.Error(), 500)
-				return
-			}
-
-			// marshal response
-			b, err = codec.Marshal(msg)
-			if err != nil {
-				http.Error(w, err.Error(), 500)
-				return
-			}
-
-			rsp := &http.Response{
-				Header:        r.Header,
-				Body:          &buffer{bytes.NewBuffer(b)},
-				Status:        "200 OK",
-				StatusCode:    200,
-				Proto:         "HTTP/1.1",
-				ProtoMajor:    1,
-				ProtoMinor:    1,
-				ContentLength: int64(len(b)),
-			}
-
-			// write response
-			rsp.Write(bufrw)
-			bufrw.Flush()
-		}
-	})
-	go http.Serve(l, mux)
-
-	if err := r.Register(&registry.Service{
-		Name: "test.service",
-		Nodes: []*registry.Node{
-			{
-				Id:      "test.service.1",
-				Address: l.Addr().String(),
-				Metadata: map[string]string{
-					"protocol": "http",
-				},
-			},
-		},
-	}); err != nil {
-		t.Fatal(err)
-	}
-
-	c := NewClient(client.Router(s))
-	req := c.NewRequest("test.service", "/foo/bar", new(test.Message))
-	stream, err := c.Stream(context.TODO(), req)
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer stream.Close()
-
-	for i := 0; i < 10; i++ {
-		msg := &test.Message{
-			Seq:  int64(i),
-			Data: fmt.Sprintf("message %d", i),
-		}
-		err := stream.Send(msg)
-		if err != nil {
-			t.Fatal(err)
-		}
-		rsp := new(test.Message)
-		err = stream.Recv(rsp)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if rsp.Seq != msg.Seq {
-			t.Fatalf("invalid seq %d for %d", rsp.Seq, msg.Seq)
-		}
-	}
-}

message.go

@@ -1,40 +0,0 @@
-package http
-
-import (
-	"github.com/micro/go-micro/v2/client"
-)
-
-type httpMessage struct {
-	topic       string
-	contentType string
-	payload     interface{}
-}
-
-func newHTTPMessage(topic string, payload interface{}, contentType string, opts ...client.MessageOption) client.Message {
-	var options client.MessageOptions
-	for _, o := range opts {
-		o(&options)
-	}
-
-	if len(options.ContentType) > 0 {
-		contentType = options.ContentType
-	}
-
-	return &httpMessage{
-		payload:     payload,
-		topic:       topic,
-		contentType: contentType,
-	}
-}
-
-func (h *httpMessage) ContentType() string {
-	return h.contentType
-}
-
-func (h *httpMessage) Topic() string {
-	return h.topic
-}
-
-func (h *httpMessage) Payload() interface{} {
-	return h.payload
-}

options.go

@@ -0,0 +1,148 @@
+package http
+
+import (
+	"context"
+	"crypto/tls"
+	"net"
+	"net/http"
+	"time"
+
+	"go.unistack.org/micro/v4/client"
+)
+
+// --------------------------------------------- HTTPClient option -----------------------------------------------------
+type httpClientKey struct{}
+
+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{}
+
+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{}
+
+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{}
+
+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{}
+
+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]any) client.CallOption {
+	return client.SetCallOption(errorMapKey{}, m)
+}
+
+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{}
+
+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{}
+
+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

@@ -1,41 +1,17 @@
 package http
 
 import (
-	"github.com/micro/go-micro/v2/client"
+	"go.unistack.org/micro/v4/client"
-	"github.com/micro/go-micro/v2/codec"
+	"go.unistack.org/micro/v4/codec"
 )
 
 type httpRequest struct {
 	service string
 	method  string
-	contentType string
+	request any
-	request     interface{}
 	opts    client.RequestOptions
 }
 
-func newHTTPRequest(service, method string, request interface{}, contentType string, reqOpts ...client.RequestOption) client.Request {
-	var opts client.RequestOptions
-	for _, o := range reqOpts {
-		o(&opts)
-	}
-
-	if len(opts.ContentType) > 0 {
-		contentType = opts.ContentType
-	}
-
-	return &httpRequest{
-		service:     service,
-		method:      method,
-		request:     request,
-		contentType: contentType,
-		opts:        opts,
-	}
-}
-
-func (h *httpRequest) ContentType() string {
-	return h.contentType
-}
-
 func (h *httpRequest) Service() string {
 	return h.service
 }
@@ -48,14 +24,18 @@ func (h *httpRequest) Endpoint() string {
 	return h.method
 }
 
-func (h *httpRequest) Codec() codec.Writer {
+func (h *httpRequest) ContentType() string {
-	return nil
+	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

@@ -1,131 +0,0 @@
-package http
-
-import (
-	"bufio"
-	"bytes"
-	"context"
-	"errors"
-	"io/ioutil"
-	"net"
-	"net/http"
-	"net/url"
-	"sync"
-
-	"github.com/micro/go-micro/v2/client"
-)
-
-// Implements the streamer interface
-type httpStream struct {
-	sync.RWMutex
-	address string
-	codec   Codec
-	context context.Context
-	header  http.Header
-	seq     uint64
-	closed  chan bool
-	err     error
-	conn    net.Conn
-	reader  *bufio.Reader
-	request client.Request
-}
-
-var (
-	errShutdown = errors.New("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) Send(msg interface{}) error {
-	h.Lock()
-	defer h.Unlock()
-
-	if h.isClosed() {
-		h.err = errShutdown
-		return errShutdown
-	}
-
-	b, err := h.codec.Marshal(msg)
-	if err != nil {
-		return err
-	}
-
-	buf := &buffer{bytes.NewBuffer(b)}
-	defer buf.Close()
-
-	req := &http.Request{
-		Method: "POST",
-		URL: &url.URL{
-			Scheme: "http",
-			Host:   h.address,
-			Path:   h.request.Endpoint(),
-		},
-		Header:        h.header,
-		Body:          buf,
-		ContentLength: int64(len(b)),
-		Host:          h.address,
-	}
-
-	return req.Write(h.conn)
-}
-
-func (h *httpStream) Recv(msg interface{}) error {
-	h.Lock()
-	defer h.Unlock()
-
-	if h.isClosed() {
-		h.err = errShutdown
-		return errShutdown
-	}
-
-	rsp, err := http.ReadResponse(h.reader, new(http.Request))
-	if err != nil {
-		return err
-	}
-	defer rsp.Body.Close()
-
-	b, err := ioutil.ReadAll(rsp.Body)
-	if err != nil {
-		return err
-	}
-
-	if rsp.StatusCode != 200 {
-		return errors.New(rsp.Status + ": " + string(b))
-	}
-
-	return h.codec.Unmarshal(b, msg)
-}
-
-func (h *httpStream) Error() error {
-	h.RLock()
-	defer h.RUnlock()
-	return h.err
-}
-
-func (h *httpStream) Close() error {
-	select {
-	case <-h.closed:
-		return nil
-	default:
-		close(h.closed)
-		return h.conn.Close()
-	}
-}

test/test.pb.go

@@ -1,64 +0,0 @@
-// Code generated by protoc-gen-go.
-// source: github.com/micro/go-plugins/client/http/v2/proto/test.proto
-// DO NOT EDIT!
-
-/*
-Package test is a generated protocol buffer package.
-
-It is generated from these files:
-	github.com/micro/go-plugins/client/http/v2/proto/test.proto
-
-It has these top-level messages:
-	Message
-*/
-package test
-
-import (
-	fmt "fmt"
-
-	proto "github.com/golang/protobuf/proto"
-
-	math "math"
-)
-
-// Reference imports to suppress errors if they are not otherwise used.
-var _ = proto.Marshal
-var _ = fmt.Errorf
-var _ = math.Inf
-
-// This is a compile-time assertion to ensure that this generated file
-// is compatible with the proto package it is being compiled against.
-// A compilation error at this line likely means your copy of the
-// proto package needs to be updated.
-const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
-
-type Message struct {
-	Seq  int64  `protobuf:"varint,1,opt,name=seq" json:"seq,omitempty"`
-	Data string `protobuf:"bytes,2,opt,name=data" json:"data,omitempty"`
-}
-
-func (m *Message) Reset()                    { *m = Message{} }
-func (m *Message) String() string            { return proto.CompactTextString(m) }
-func (*Message) ProtoMessage()               {}
-func (*Message) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
-
-func init() {
-	proto.RegisterType((*Message)(nil), "test.Message")
-}
-
-func init() {
-	proto.RegisterFile("github.com/micro/go-plugins/client/http/v2/proto/test.proto", fileDescriptor0)
-}
-
-var fileDescriptor0 = []byte{
-	// 131 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x1c, 0xcb, 0xb1, 0x0e, 0x82, 0x30,
-	0x10, 0x06, 0xe0, 0x54, 0x88, 0xc6, 0x4e, 0xa6, 0x13, 0x23, 0x71, 0x62, 0x91, 0x1b, 0x5c, 0x7c,
-	0x09, 0x17, 0xde, 0xa0, 0xd4, 0x4b, 0x69, 0x02, 0x5c, 0xe5, 0x7e, 0xde, 0x9f, 0xd0, 0xed, 0x5b,
-	0x3e, 0xfb, 0x89, 0x09, 0xd3, 0x3e, 0xf6, 0x41, 0x16, 0x5a, 0x52, 0xd8, 0x84, 0xa2, 0xbc, 0xf2,
-	0xbc, 0xc7, 0xb4, 0x2a, 0x85, 0x39, 0xf1, 0x0a, 0x9a, 0x80, 0x4c, 0x79, 0x13, 0x08, 0x81, 0x15,
-	0x7d, 0xa1, 0xab, 0x4f, 0x3f, 0xc9, 0xde, 0xbe, 0xac, 0xea, 0x23, 0xbb, 0x87, 0xad, 0x94, 0xff,
-	0x8d, 0x69, 0x4d, 0x57, 0x0d, 0x27, 0x9d, 0xb3, 0xf5, 0xcf, 0xc3, 0x37, 0x97, 0xd6, 0x74, 0xf7,
-	0xa1, 0x78, 0xbc, 0x96, 0xfd, 0x3e, 0x02, 0x00, 0x00, 0xff, 0xff, 0xff, 0x16, 0x8d, 0x95, 0x79,
-	0x00, 0x00, 0x00,
-}

test/test.proto

@@ -1,8 +0,0 @@
-syntax = "proto3";
-
-package test;
-
-message Message {
-	int64 seq = 1;
-	string data = 2;
-}