.build()
    assertThat(cookie.name).isEqualTo("a")
    assertThat(cookie.value).isEqualTo("b")
    assertThat(cookie.expiresAt).isEqualTo(MAX_DATE)
    assertThat(cookie.domain).isEqualTo("example.com")
    assertThat(cookie.path).isEqualTo("/")
    assertThat(cookie.secure).isFalse()
    assertThat(cookie.httpOnly).isFalse()
    assertThat(cookie.persistent).isFalse()
    assertThat(cookie.hostOnly).isFalse()

import java.util.Deque

class RecordingCookieJar : CookieJar {
  private val requestCookies: Deque<List<Cookie>> = ArrayDeque()
  private val responseCookies: Deque<List<Cookie>> = ArrayDeque()

  fun enqueueRequestCookies(vararg cookies: Cookie) {
    requestCookies.add(cookies.toList())
  }

  fun takeResponseCookies(): List<Cookie> = responseCookies.removeFirst()

  fun assertResponseCookies(vararg cookies: String?) {

                                "in": "cookie",
                                "required": True,
                                "schema": {"type": "string", "title": "Session Id"},
                            },
                            {
                                "name": "fatebook_tracker",
                                "in": "cookie",
                                "required": False,

You can define Header parameters the same way you define `Query`, `Path` and `Cookie` parameters.

## Import `Header` { #import-header }

First import `Header`:

{* ../../docs_src/header_params/tutorial001_an_py310.py hl[3] *}

## Declare `Header` parameters { #declare-header-parameters }

Then declare the header parameters using the same structure as with `Path`, `Query` and `Cookie`.

import pytest
from fastapi import Cookie, FastAPI
from fastapi.testclient import TestClient
from pydantic import BaseModel, Field

app = FastAPI()

# =====================================================================================
# Without aliases


@app.get("/optional-str")
async def read_optional_str(p: Annotated[Optional[str], Cookie()] = None):
    return {"p": p}

    }

    return responseBuilder.build()
  }

  /** Returns a 'Cookie' HTTP request header with all cookies, like `a=b; c=d`. */
  private fun cookieHeader(cookies: List<Cookie>): String =
    buildString {
      cookies.forEachIndexed { index, cookie ->
        if (index > 0) append("; ")
        append(cookie.name).append('=').append(cookie.value)
      }
    }

**FastAPI** использует этот *временный* ответ, чтобы извлечь HTTP-заголовки (а также cookie и статус-код) и поместит их в финальный HTTP-ответ, который содержит возвращённое вами значение, отфильтрованное согласно `response_model`.

Вы также можете объявлять параметр `Response` в зависимостях и устанавливать в них заголовки (и cookie).

## Вернуть `Response` напрямую { #return-a-response-directly }

import okhttp3.internal.connection.RealConnection

internal fun parseCookie(
  currentTimeMillis: Long,
  url: HttpUrl,
  setCookie: String,
): Cookie? = Cookie.parse(currentTimeMillis, url, setCookie)

internal fun cookieToString(
  cookie: Cookie,
  forObsoleteRfc2965: Boolean,
): String = cookie.toString(forObsoleteRfc2965)

internal fun addHeaderLenient(
  builder: Headers.Builder,
  line: String,

            assert data == "Session cookie or query token value is: fakesession"
            data = websocket.receive_text()
            assert data == f"Message text was: {message}, for item ID: foo"
            message = "Message two"
            websocket.send_text(message)
            data = websocket.receive_text()
            assert data == "Session cookie or query token value is: fakesession"

        (
            "/items",
            None,
            200,
            {"q_or_cookie": None},
        ),
    ],
)
def test_get(path, cookie, expected_status, expected_response, client: TestClient):
    if cookie is not None:
        client.cookies.set("last_query", cookie)
    else:
        client.cookies.clear()
    response = client.get(path)
    assert response.status_code == expected_status