url: https://github.com/fastapi/fastapi/discussions/categories/questions
  - name: Feature Request
    about: To suggest an idea or ask about a feature, please start with a question saying what you would like to achieve. There might be a way to do it already.
    url: https://github.com/fastapi/fastapi/discussions/categories/questions
  - name: Show and tell
    about: Show what you built with FastAPI or to be used with FastAPI.

     * environment like {@link System#getProperties()} and environment variables.
     *
     * @return The system properties, never {@code null}.
     */
    Properties getSystemProperties();

    /**
     * Sets the system properties to use for interpolation. The system properties are collected from the runtime
     * environment like {@link System#getProperties()} and environment variables.
     *

Si estás transmitiendo JSON Lines, sigue el tutorial [Stream JSON Lines](../tutorial/stream-json-lines.md).

///

### `FileResponse` { #fileresponse }

Transmite un archivo asincrónicamente como response.

   * already been re-added.
   */
  // Technically should accept RemovalNotification<? extends K, ? extends V>, but because
  // RemovalNotification is guaranteed covariant, let's make users' lives simpler.
  void onRemoval(RemovalNotification<K, V> notification);

Each file is a list of API features, one per line.

go1.txt (and similarly named files) are frozen once a version has been
shipped. Each file adds new lines but does not remove any.

except.txt lists features that may disappear without breaking true
compatibility.

Starting with go1.19.txt, each API feature line must end in "#nnnnn"

        ianaSuites.fromJavaName(it.javaName)
      },
  )

fun historicOkHttp(version: String): Client {
  val enabled =
    FileSystem.RESOURCES.read("okhttp_$version.txt".toPath()) {
      this.readUtf8().lines().filter { it.isNotBlank() }.map {
        SuiteId(id = null, name = it.trim())
      }
    }
  return Client(
    userAgent = "OkHttp",
    version = version,
    enabled = enabled,
  )
}

@REM   MAVEN_DEBUG_ADDRESS (Optional) Set the debug address. Default value is localhost:8000
@REM -----------------------------------------------------------------------------

@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
@echo off
@REM set title of command window
title %0
@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
@if "%MAVEN_BATCH_ECHO%"=="on" echo %MAVEN_BATCH_ECHO%

@setlocal

Si vous diffusez des JSON Lines, suivez le didacticiel [Diffuser des JSON Lines](../tutorial/stream-json-lines.md).

///

### `FileResponse` { #fileresponse }

Diffuse de façon asynchrone un fichier comme réponse.

    Java package; see
    https://groups.google.com/g/google-web-toolkit-contributors/c/CqYH59Dt_rQ/m/uVGW1QdUsXUJ
    for details.

    The summary is that it ignores one file in favor of the other.
    util.concurrent, like nearly all our packages, has two .gwt.xml files: one
    for prod and one for tests. However, unlike our other packages, as of this
    writing it has test supersource but no prod supersource.

对于大型或无限流，这一点更为重要。

///

/// tip | 提示

与其直接返回 `StreamingResponse`，更推荐遵循 [流式数据](./stream-data.md) 的写法，它更方便并在幕后为你处理取消。

如果你在流式传输 JSON Lines，请参阅教程：[流式传输 JSON Lines](../tutorial/stream-json-lines.md)。

///

### `FileResponse` { #fileresponse }

异步传输文件作为响应。

与其他响应类型相比，接受不同的参数集进行实例化：

* `path` - 要流式传输的文件的文件路径。
* `headers` - 任何自定义响应头，传入字典类型。