call.eventListener.requestFailed(call, e)
      trackFailure(e)
      throw e
    }
  }

  @Throws(IOException::class)
  fun createRequestBody(
    request: Request,
    duplex: Boolean,
  ): Sink {
    this.isDuplex = duplex
    val contentLength = request.body!!.contentLength()
    call.eventListener.requestBodyStart(call)
    val rawRequestBody = codec.createRequestBody(request, contentLength)
    return RequestBodySink(

---

Ama bu örnek kodun detaylarını merak ediyorsanız, birkaç ek bilgi:

#### `value.startswith()` ile String { #string-with-value-startswith }

Fark ettiniz mi? `value.startswith()` ile bir string, tuple alabilir ve tuple içindeki her değeri kontrol eder:

{* ../../docs_src/query_params_str_validations/tutorial015_an_py310.py ln[16:19] hl[17] *}

#### Rastgele Bir Item { #a-random-item }

        match="Query parameter 'q' must be one of the supported types",
    ):
        app = FastAPI()

        class Item(BaseModel):
            title: str

        @app.get("/items/")
        def read_items(q: tuple[Item, Item] = Query(default=None)):
            pass  # pragma: no cover


def test_invalid_dict():
    with pytest.raises(
        AssertionError,

没有类型的话，这几乎是不可能做到的。

注意，变量 `item` 是列表 `items` 中的一个元素。

即便如此，编辑器仍然知道它是 `str`，并为此提供支持。

#### 元组和集合 { #tuple-and-set }

声明 `tuple` 和 `set` 的方式类似：

{* ../../docs_src/python_types/tutorial007_py310.py hl[1] *}

这表示：

* 变量 `items_t` 是一个含有 3 个元素的 `tuple`，分别是一个 `int`、另一个 `int`，以及一个 `str`。
* 变量 `items_s` 是一个 `set`，其中每个元素的类型是 `bytes`。

#### 字典 { #dict }

        lang_path_root / "how-to",
    ]
    first_parent = lang_path_root
    yield from first_parent.glob("*.md")
    for dir_path in first_dirs:
        yield from dir_path.rglob("*.md")
    first_dirs_str = tuple(str(d) for d in first_dirs)
    for path in lang_path_root.rglob("*.md"):
        if str(path).startswith(first_dirs_str):
            continue
        if path.parent == first_parent:
            continue

pkg go/types, method (*Struct) Tag(int) string
pkg go/types, method (*Struct) Underlying() Type
pkg go/types, method (*Tuple) At(int) *Var
pkg go/types, method (*Tuple) Len() int
pkg go/types, method (*Tuple) String() string
pkg go/types, method (*Tuple) Underlying() Type
pkg go/types, method (*TypeName) Exported() bool
pkg go/types, method (*TypeName) Id() string
pkg go/types, method (*TypeName) Name() string

    Interceptors that rewrite or replace the request body may now inadvertently interfere with
    duplex request bodies. Such interceptors should check `RequestBody.isDuplex()` and avoid
    accessing the request body when it is.

    Duplex calls require HTTP/2. If HTTP/1 is established instead the duplex call will fail. The
    most common use of duplex calls is [gRPC][grpc_http2].

変数 `item` はリスト `items` の要素の一つであることに注意してください。

それでも、エディタはそれが `str` であることを知っていて、そのためのサポートを提供しています。

#### Tuple と Set { #tuple-and-set }

`tuple` と `set` の宣言も同様です:

{* ../../docs_src/python_types/tutorial007_py310.py hl[1] *}

つまり:

* 変数 `items_t` は `int`、別の `int`、`str` の 3 つの項目を持つ `tuple` です。
* 変数 `items_s` は `set` であり、その各項目は `bytes` 型です。

#### Dict { #dict }

    private set

  // These properties are guarded by `this`. They are typically only accessed by the thread executing
  // the call, but they may be accessed by other threads for duplex requests.

  private var requestBodyOpen = false
  private var responseBodyOpen = false
  private var socketSinkOpen = false
  private var socketSourceOpen = false

          exchange.responseHeadersStart()
          invokeStartEvent = false
        }
        if (responseBuilder == null) {
          if (requestBody.isDuplex()) {
            // Prepare a duplex body so that the application can send a request body later.
            exchange.flushRequest()
            val bufferedRequestBody = exchange.createRequestBody(request, true).buffer()