r.Read(buf)
	if string(buf) != "foo" {
		t.Errorf("buf = %q; want foo", buf)
	}

	r.Reset(strings.NewReader("bar bar"))
	checkAll(r, "bar bar")

	*r = Reader{} // zero out the Reader
	r.Reset(strings.NewReader("bar bar"))
	checkAll(r, "bar bar")

	// Wrap a reader and then Reset to that reader.
	r.Reset(strings.NewReader("recur"))
	r2 := NewReader(r)
	checkAll(r2, "recur")

import java.util.Iterator;
import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A simplistic collection which implements only the bare minimum allowed by the spec, and throws
 * exceptions whenever it can.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault

    private static final String COMMENT = "# comment";
    private static final String KEY1 = "mvn:foo/bar";
    private static final String KEY1A = "mvn\\:foo/bar";
    private static final String KEY2 = "foo:bar:version:type:classifier";
    private static final String KEY2A = "foo\\:bar\\:version\\:type\\:classifier";
    private static final String VALUE1 = "value";

    private MavenProperties properties;

            "X-Token": "fake-super-secret-token",
            "X-Key": "fake-super-secret-key",
        },
    )
    assert response.status_code == 200, response.text
    assert response.json() == [{"item": "Foo"}, {"item": "Bar"}]


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

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

もし、その*path operation*で通信する場合は、次のように２つのHTTPヘッダーを送信します:

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

このレスポンスは以下のようになります:

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

## まとめ

ヘッダーは`Header`で宣言し、`Query`や`Path`、`Cookie`と同じパターンを使用する。

    assert response.status_code == 200
    assert response.json() == {"name": "Plumbus", "item_id": "plumbus"}


def test_items_bar_token_jessica(client: TestClient):
    response = client.get(
        "/items/bar?token=jessica", headers={"X-Token": "fake-super-secret-token"}
    )
    assert response.status_code == 404
    assert response.json() == {"detail": "Item not found"}

@app.post("/")
async def post(
    foo: Union[Foo, None] = None,
):
    return foo


client = TestClient(app)


def test_call_invalid():
    response = client.post("/", json={"foo": {"bar": "baz"}})
    assert response.status_code == 422


def test_call_valid():
    response = client.post("/", json={})
    assert response.status_code == 200
    assert response.json() == {}

    assert response.status_code == 200, response.text
    assert response.json() == {"id": "foo", "value": "there goes my hero"}


def test_path_operation_not_found():
    response = client.get("/items/bar")
    assert response.status_code == 404, response.text
    assert response.json() == {"message": "Item not found"}


def test_openapi_schema():
    response = client.get("/openapi.json")

Затем, получив такой URL:

```
http://localhost:8000/items/?q=foo&q=bar
```

вы бы получили несколько значений (`foo` и `bar`), которые относятся к параметру `q`, в виде Python `list` внутри вашей *функции обработки пути*, в *параметре функции* `q`.

Таким образом, ответ на этот URL будет:

```JSON
{
  "q": [
    "foo",
    "bar"
  ]
}
```

/// tip | "Подсказка"

                                        "description": "FastAPI can convert price `strings` to actual `numbers` automatically",
                                        "value": {"name": "Bar", "price": "35.4"},
                                    },
                                    "invalid": {
                                        "summary": "Invalid data is rejected with an error",