155 lines
3.3 KiB
Markdown
155 lines
3.3 KiB
Markdown
# HTTP Client
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This plugin is an HTTP client for [Micro](https://pkg.go.dev/go.unistack.org/micro/v4).
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It implements the [micro.Client](https://pkg.go.dev/go.unistack.org/micro/v4/client#Client) interface.
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## Overview
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The HTTP client wraps `net/http` to provide a robust client with service discovery, load balancing and
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implements HTTP rules defined in the [google/api/http.proto](https://github.com/googleapis/googleapis/blob/master/google/api/http.proto) specification.
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## Limitations
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* Streaming is not yet implemented.
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* Only protobuf-generated messages are supported.
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## Usage
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```go
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import (
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"go.unistack.org/micro/v4"
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http "go.unistack.org/micro-client-http/v4"
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)
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service := micro.NewService(
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micro.Name("my.service"),
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micro.Client(http.NewClient()),
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)
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```
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### Simple call
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```go
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import (
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"go.unistack.org/micro/v4/client"
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http "go.unistack.org/micro-client-http/v4"
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jsoncodec "go.unistack.org/micro-codec-json/v4"
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)
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c := http.NewClient(
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client.Codec("application/json", jsoncodec.NewCodec()),
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)
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req := c.NewRequest(
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"user-service",
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"/user/{user_id}/order/{order_id}",
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&protoReq{UserId: "123", OrderId: 456},
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)
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rsp := new(protoRsp)
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err := c.Call(
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ctx,
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req,
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rsp,
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client.WithAddress("example.com"),
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)
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```
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### Call with specific options
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```go
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import (
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"go.unistack.org/micro/v4/client"
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http "go.unistack.org/micro-client-http/v4"
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)
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err := c.Call(
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ctx,
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req,
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rsp,
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client.WithAddress("example.com"),
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http.Method("POST"),
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http.Path("/user/{user_id}/order/{order_id}"),
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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)
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)
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```
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### Call with request headers
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```go
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import (
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"go.unistack.org/micro/v4/metadata"
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http "go.unistack.org/micro-client-http/v4"
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)
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ctx := metadata.NewOutgoingContext(ctx, metadata.Pairs(
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"Authorization", "Bearer token",
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"My-Header", "My-Header-Value",
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))
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err := c.Call(
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ctx,
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req,
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rsp,
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http.Header("Authorization", "true", "My-Header", "false"), // <- call option that declares required/optional headers
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)
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```
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### Call with response headers
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```go
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import (
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"go.unistack.org/micro/v4/metadata"
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http "go.unistack.org/micro-client-http/v4"
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)
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respMetadata := metadata.Metadata{}
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err := c.Call(
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ctx,
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req,
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rsp,
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client.WithResponseMetadata(&respMetadata), // <- metadata with response headers
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)
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```
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### Call with cookies
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```go
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import (
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"go.unistack.org/micro/v4/metadata"
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http "go.unistack.org/micro-client-http/v4"
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)
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ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(
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"Cookie", "session_id=abc123; theme=dark",
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))
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err := c.Call(
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ctx,
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req,
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rsp,
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http.Cookie("session_id", "true", "theme", "false"), // <- call option that declares required/optional cookies
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)
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```
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### Call with error mapping
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```go
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import (
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http "go.unistack.org/micro-client-http/v4"
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jsoncodec "go.unistack.org/micro-codec-json/v4"
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)
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err := c.Call(
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ctx,
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req,
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rsp,
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http.ErrorMap(map[string]any{
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"default": &protoDefaultError{}, // <- default case
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"403": &protoSpecialError{}, // <- key is the HTTP status code that is mapped to this error
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}),
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)
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```
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