/**
   * http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-12#appendix-C.2.2
   */
  @Test
  fun literalHeaderFieldWithoutIndexingIndexedName() {
    val headerBlock = headerEntries(":path", "/sample/path")
    bytesIn.writeByte(0x04) // == Literal not indexed ==
    // Indexed name (idx = 4) -> :path
    bytesIn.writeByte(0x0c) // Literal value (len = 12)
    bytesIn.writeUtf8("/sample/path")

In above example there are two server pools

- 32 * 32 = 1024 drives pool1
- 12 * 12 = 144 drives pool2

> Notice the requirement of common SLA here original cluster had 1024 drives with 16 drives per erasure set with default parity of '4', second pool is expected to have a minimum of 8 drives per erasure set to match the original cluster SLA (parity count) of '4'. '12' drives stripe per erasure set in the second pool satisfies the original pool's parity count.

    val headers = headersOf("Cache-Control", "max-age=12", "Pragma", "must-revalidate", "Pragma", "public")
    val cacheControl = parse(headers)
    assertThat(cacheControl.toString()).isEqualTo("max-age=12, public, must-revalidate")
  }

  @Test
  fun parseCacheControlHeaderValueIsRetained() {
    val value = "max-age=12"
    val headers = headersOf("Cache-Control", value)

    ```

=== "Python 3.8+"

    ```Python hl_lines="12-15"
    {!> ../../../docs_src/body_fields/tutorial001_an.py!}
    ```

=== "Python 3.10+ non-Annotated"

    !!! tip
        Варто користуватись `Annotated` версією, якщо це можливо..

    ```Python hl_lines="9-12"
    {!> ../../../docs_src/body_fields/tutorial001_py310.py!}
    ```

=== "Python 3.8+ non-Annotated"

    "LC_CTYPE",

    "JDK_10",
    "JDK_10_0",
    "JDK_10_0_x64",
    "JDK_10_x64",
    "JDK_11",
    "JDK_11_0",
    "JDK_11_0_x64",
    "JDK_11_x64",
    "JDK_12",
    "JDK_12_0",
    "JDK_12_0_x64",
    "JDK_12_x64",
    "JDK_13",
    "JDK_13_0",
    "JDK_13_0_x64",
    "JDK_13_x64",
    "JDK_14",
    "JDK_14_0",
    "JDK_14_0_x64",
    "JDK_15",
    "JDK_15_0",
    "JDK_15_0_x64",

|      11 |                 2 |          11 |                       4 |                             4 |                              4 |
|      12 |                 2 |          12 |                       4 |                             4 |                              4 |

    assertThat(formEncode(12)).isEqualTo("%0C")
    // Browsers convert '\r' to '\r\n'
    assertThat(formEncode(13)).isEqualTo("%0D")
    assertThat(formEncode(14)).isEqualTo("%0E")
    assertThat(formEncode(15)).isEqualTo("%0F")
    assertThat(formEncode(16)).isEqualTo("%10")
    assertThat(formEncode(17)).isEqualTo("%11")
    assertThat(formEncode(18)).isEqualTo("%12")
    assertThat(formEncode(19)).isEqualTo("%13")

Create a response as described in [Return a Response Directly](response-directly.md){.internal-link target=_blank} and pass the headers as an additional parameter:

```Python hl_lines="10-12"
{!../../../docs_src/response_headers/tutorial001.py!}
```

!!! note "Technical Details"
    You could also use `from starlette.responses import Response` or `from starlette.responses import JSONResponse`.

# 请求体 - 嵌套模型

使用 **FastAPI**，你可以定义、校验、记录文档并使用任意深度嵌套的模型（归功于Pydantic）。

## List 字段

你可以将一个属性定义为拥有子元素的类型。例如 Python `list`：

=== "Python 3.10+"

    ```Python hl_lines="12"
    {!> ../../../docs_src/body_nested_models/tutorial001_py310.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="14"
    {!> ../../../docs_src/body_nested_models/tutorial001.py!}
    ```

这将使 `tags` 成为一个由元素组成的列表。不过它没有声明每个元素的类型。

    ```

## `File` und `Form`-Parameter definieren

Erstellen Sie Datei- und Formularparameter, so wie Sie es auch mit `Body` und `Query` machen würden:

=== "Python 3.9+"

    ```Python hl_lines="10-12"
    {!> ../../../docs_src/request_forms_and_files/tutorial001_an_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="9-11"
    {!> ../../../docs_src/request_forms_and_files/tutorial001_an.py!}
    ```