これは例えば、カスタムヘッダーやcookieを返すときに便利です。

## `Response` を返す

実際は、`Response` やそのサブクラスを返すことができます。

!!! tip "豆知識"
    `JSONResponse` それ自体は、 `Response` のサブクラスです。

`Response` を返した場合は、**FastAPI** は直接それを返します。

それは、Pydanticモデルのデータ変換や、コンテンツを任意の型に変換したりなどはしません。

これは多くの柔軟性を提供します。任意のデータ型を返したり、任意のデータ宣言やバリデーションをオーバーライドできます。

## `jsonable_encoder` を `Response` の中で使う

**FastAPI** はあなたが返す `Response` に対して何も変更を加えないので、コンテンツが準備できていることを保証しなければなりません。

			}
			return
		}
		select {
		case a.responses <- resp:
		case <-a.context.Done():
			return
		}
	}
}

// DrainResponses reads all responses, but does nothing to them
func (a *AdsTest) DrainResponses() {
	for {
		select {
		case <-a.context.Done():
			return
		case r := <-a.responses:
			log.Infof("drained response %v", r.TypeUrl)
		}
	}
}

from typing import Union

from fastapi import FastAPI
from fastapi.responses import FileResponse
from pydantic import BaseModel


class Item(BaseModel):
    id: str
    value: str


responses = {
    404: {"description": "Item not found"},
    302: {"description": "The item was moved"},
    403: {"description": "Not enough privileges"},
}


app = FastAPI()


@app.get(
    "/items/{item_id}",

			err = fmt.Errorf("unexpected number of responses: expected %d, received %d",
				opts.Count, len(responses))
		}

		// Convert to a CallResult.
		result := echo.CallResult{
			From:      from,
			Opts:      opts,
			Responses: responses,
		}

		// Return the results from the validator.
		err = opts.Check(result, err)
		if err != nil {
			err = fmt.Errorf("call failed from %s to %s (using %s): %v",

    * Ein spezieller Fall ist `204`, „No Content“ („Kein Inhalt“). Diese Response wird verwendet, wenn es keinen Inhalt gibt, der zum Client zurückgeschickt wird, diese Response hat also keinen Body.
* **`300`** und darüber steht für „Redirection“ („Umleitung“).  Responses mit diesen Statuscodes können einen oder keinen Body haben, mit Ausnahme von `304`, „Not Modified“ („Nicht verändert“), welche keinen haben darf.

)

func ParseResponses(req *proto.ForwardEchoRequest, resp *proto.ForwardEchoResponse) Responses {
	responses := make([]Response, len(resp.Output))
	for i, output := range resp.Output {
		responses[i] = parseResponse(output)
		responses[i].RequestURL = req.Url
	}
	return responses
}

func parseResponse(output string) Response {
	out := Response{
		RawContent:      output,
		RequestHeaders:  make(http.Header),

[short] skip

env GO111MODULE=on
env GOSUMDB=off
env GOPROXY=direct

# Server responses should be truncated to some reasonable number of lines.
# (For now, exactly eight.)
! go list -m vcs-test.golang.org/auth/ormanylines@latest
stderr '\tserver response:\n(.|\n)*\tline 8\n\t\[Truncated: too many lines.\]$'

# Server responses should be truncated to some reasonable number of characters.
! go list -m vcs-test.golang.org/auth/oronelongline@latest

    route: Route?,
    response: Response,
  ): Request? {
    if (route == null) throw NullPointerException("route == null")
    responses += response
    routes += route
    if (!schemeMatches(response) || credential == null) return null
    val header =
      when (response.code) {
        407 -> "Proxy-Authorization"
        else -> "Authorization"
      }
    return response.request.newBuilder()

)
def test_query_params_str_validations(path, expected_status, expected_response):
    response = client.get(path)
    assert response.status_code == expected_status
    assert response.json() == expected_response


def test_openapi_schema():
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",

from your test's `tearDown()`.

### API

#### MockResponse

Mock responses default to an empty response body and a `200` status code.
You can set a custom body with a string, input stream or byte array. Also
add headers with a fluent builder API.

```java
MockResponse response = new MockResponse()
    .addHeader("Content-Type", "application/json; charset=utf-8")