# ヘッダーのパラメータ

ヘッダーのパラメータは、`Query`や`Path`、`Cookie`のパラメータを定義するのと同じように定義できます。

## `Header`をインポート

まず、`Header`をインポートします:

```Python hl_lines="3"
{!../../../docs_src/header_params/tutorial001.py!}
```

## `Header`のパラメータの宣言

次に、`Path`や`Query`、`Cookie`と同じ構造を用いてヘッダーのパラメータを宣言します。

最初の値がデフォルト値で、追加の検証パラメータや注釈パラメータをすべて渡すことができます。

```Python hl_lines="9"
{!../../../docs_src/header_params/tutorial001.py!}
```

!!! note "技術詳細"

						Cookie: &httpv3.Cookie{
							Path: "/",
							Name: "test-cookie",
						},
					}),
				},
			},
		},
		{
			name: "service with cookie path",
			service: &model.Service{
				Attributes: model.ServiceAttributes{
					Labels: map[string]string{features.PersistentSessionLabel: "test-cookie:/path"},
				},
			},
			expectedconfig: &statefulsession.StatefulSession{

    from typing import Annotated

    from fastapi import (
        Cookie,
        FastAPI,
        WebSocket,
        WebSocketException,
        status,
    )

    app = FastAPI()

    @app.websocket("/items/{item_id}/ws")
    async def websocket_endpoint(
        *,
        websocket: WebSocket,
        session: Annotated[str | None, Cookie()] = None,
        item_id: str,
    ):
        if session is None:

pkg net, type ListenConfig struct, KeepAliveConfig KeepAliveConfig #62254
pkg net/http, func ParseCookie(string) ([]*Cookie, error) #66008
pkg net/http, func ParseSetCookie(string) (*Cookie, error) #66008
pkg net/http, method (*Request) CookiesNamed(string) []*Cookie #61472
pkg net/http, type Cookie struct, Partitioned bool #62490
pkg net/http, type Cookie struct, Quoted bool #46443
pkg net/http, type Request struct, Pattern string #66405

func TestRequestCookiesByName(t *testing.T) {
	tests := []struct {
		in     []*Cookie
		filter string
		want   []*Cookie
	}{
		{
			in: []*Cookie{
				{Name: "foo", Value: "foo-1"},
				{Name: "bar", Value: "bar"},
			},
			filter: "foo",
			want:   []*Cookie{{Name: "foo", Value: "foo-1"}},
		},
		{
			in: []*Cookie{
				{Name: "foo", Value: "foo-1"},
				{Name: "foo", Value: "foo-2"},

import org.apache.http.impl.conn.SystemDefaultRoutePlanner;
import org.apache.http.impl.cookie.DefaultCookieSpecProvider;
import org.apache.http.impl.cookie.IgnoreSpecProvider;
import org.apache.http.impl.cookie.NetscapeDraftSpecProvider;
import org.apache.http.impl.cookie.RFC6265CookieSpecProvider;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.HttpCoreContext;

// We treat this like an ordinary system call rather than a call
// that tries to fill the buffer.
func (fd *FD) ReadDir(buf []byte, cookie syscall.Dircookie) (int, error) {
	if err := fd.incref(); err != nil {
		return 0, err
	}
	defer fd.decref()
	for {
		n, err := syscall.ReadDir(fd.Sysfd, buf, cookie)
		if err != nil {
			n = 0
			if err == syscall.EAGAIN && fd.pd.pollable() {

  hosts:
  - service3.default.svc.cluster.local
  - uk.bookinfo.com
  - eu.bookinfo.com
  gateways:
  - my-gateway
  - mesh # applies to all the sidecars in the mesh
  http:
  - match:
    - headers:
        cookie:
          regex: "^(.*?;)?(user=dev-123)(;.*)?"
    route:
    - destination:
        port:
          number: 81
        host: service3.default.svc.cluster.local
  - match:
    - uri:

    val headers =
      Headers.Builder()
        .add("content-length", "99")
        .add("authorization", "peanutbutter")
        .add("proxy-authorization", "chocolate")
        .add("cookie", "drink=coffee")
        .add("set-cookie", "accessory=sugar")
        .add("user-agent", "OkHttp")
        .build()
    val request =
      Request(
        "https://square.com".toHttpUrl(),
        headers,
      )

      labels:
        version: v1
    - name: v2
      labels:
        version: v2
      trafficPolicy:
        loadBalancer:
          consistentHash:
            httpCookie:
              name: Cookie
              ttl: 30s
            minimumRingSize: 42