val url = parse("http://host/?foo[]=1&foo[]=2&foo[]=3")
    assertThat(url.querySize).isEqualTo(3)
    assertThat(url.queryParameterNames).isEqualTo(setOf("foo[]"))
    assertThat(url.queryParameterValue(0)).isEqualTo("1")
    assertThat(url.queryParameterValue(1)).isEqualTo("2")
    assertThat(url.queryParameterValue(2)).isEqualTo("3")
    assertThat(url.queryParameterValues("foo[]")).containsExactly("1", "2", "3")
  }

client = TestClient(app)


def test_get_items():
    response = client.get("/keyword-weights/")
    assert response.status_code == 200, response.text
    assert response.json() == {"foo": 2.3, "bar": 3.4}


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

    price: float
    tax: Union[float, None] = None

    model_config = {
        "json_schema_extra": {
            "examples": [
                {
                    "name": "Foo",
                    "description": "A very nice Item",
                    "price": 35.4,
                    "tax": 3.2,
                }
            ]
        }
    }


@app.put("/items/{item_id}")

    builder.put("foo", 2);
    assertMapEquals(builder.buildOrThrow(), "foo", 2);
  }

  public void testBuilderPutImmutableEntryWithNullKeyFailsAtomically() {
    Builder<String, Integer> builder = new Builder<>();
    assertThrows(NullPointerException.class, () -> builder.put(immutableEntry((String) null, 1)));
    builder.put("foo", 2);
    assertMapEquals(builder.buildOrThrow(), "foo", 2);

    assertEquals("foobar", Ascii.truncate("foobar", 10, "…"));
    assertEquals("foo…", Ascii.truncate("foobar", 4, "…"));
    assertEquals("fo--", Ascii.truncate("foobar", 4, "--"));
    assertEquals("foobar", Ascii.truncate("foobar", 6, "…"));
    assertEquals("foob…", Ascii.truncate("foobar", 5, "…"));
    assertEquals("foo", Ascii.truncate("foobar", 3, ""));
    assertEquals("", Ascii.truncate("", 5, ""));

```Python hl_lines="9"
{!../../docs_src/header_params/tutorial003.py!}
```

다음과 같은 두 개의 HTTP 헤더를 전송하여 해당 *경로* 와 통신할 경우:

```
X-Token: foo
X-Token: bar
```

응답은 다음과 같습니다:

```JSON
{
    "X-Token values": [
        "bar",
        "foo"
    ]
}
```

## 요약

`Header`는 `Query`, `Path`, `Cookie`와 동일한 패턴을 사용하여 선언합니다.

    description: Union[str, None] = None
    price: float
    tax: Union[float, None] = None

    class Config:
        schema_extra = {
            "examples": [
                {
                    "name": "Foo",
                    "description": "A very nice Item",
                    "price": 35.4,
                    "tax": 3.2,
                }
            ]
        }


@app.put("/items/{item_id}")

@app.put("/items/{item_id}")
async def update_item(
    item_id: int,
    item: Annotated[
        Item,
        Body(
            examples=[
                {
                    "name": "Foo",
                    "description": "A very nice Item",
                    "price": 35.4,
                    "tax": 3.2,
                }
            ],
        ),
    ],
):

          @Override
          protected String serviceName() {
            return "Foo";
          }
        };
    TimeoutException e =
        assertThrows(
            TimeoutException.class, () -> service.startAsync().awaitRunning(1, MILLISECONDS));
    assertThat(e)
        .hasMessageThat()
        .isEqualTo("Timed out waiting for Foo [STARTING] to reach the RUNNING state.");
  }

```

////

Если вы взаимодействуете с этой *операцией пути*, отправляя два HTTP-заголовка, таких как:

```
X-Token: foo
X-Token: bar
```

Ответ был бы таким:

```JSON
{
    "X-Token values": [
        "bar",
        "foo"
    ]
}
```

## Резюме

Объявляйте заголовки с помощью `Header`, используя тот же общий шаблон, как при `Query`, `Path` и `Cookie`.