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  1. fastapi/concurrency.py

    from collections.abc import AsyncGenerator
    from contextlib import AbstractContextManager
    from contextlib import asynccontextmanager as asynccontextmanager
    from typing import TypeVar
    
    import anyio.to_thread
    from anyio import CapacityLimiter
    from starlette.concurrency import iterate_in_threadpool as iterate_in_threadpool  # noqa
    from starlette.concurrency import run_in_threadpool as run_in_threadpool  # noqa
    from starlette.concurrency import (  # noqa
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Wed Dec 17 21:25:59 GMT 2025
    - 1.5K bytes
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  2. docs/zh-hant/docs/advanced/async-tests.md

    你已經看過如何使用提供的 `TestClient` 來測試你的 FastAPI 應用。到目前為止,你只看到如何撰寫同步測試,沒有使用 `async` 函式。
    
    在測試中能使用非同步函式會很有用,例如當你以非同步方式查詢資料庫時。想像你想測試發送請求到 FastAPI 應用,然後在使用非同步資料庫函式庫時,驗證後端是否成功把正確資料寫入資料庫。
    
    來看看怎麼做。
    
    ## pytest.mark.anyio { #pytest-mark-anyio }
    
    若要在測試中呼叫非同步函式,測試函式本身也必須是非同步的。AnyIO 為此提供了一個好用的外掛,讓我們可以標示某些測試函式以非同步方式執行。
    
    ## HTTPX { #httpx }
    
    即使你的 FastAPI 應用使用一般的 `def` 函式而非 `async def`,它在底層仍然是個 `async` 應用。
    
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Fri Mar 20 17:05:38 GMT 2026
    - 3.5K bytes
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  3. docs_src/custom_response/tutorial007_py310.py

    import anyio
    from fastapi import FastAPI
    from fastapi.responses import StreamingResponse
    
    app = FastAPI()
    
    
    async def fake_video_streamer():
        for i in range(10):
            yield b"some fake video bytes"
            await anyio.sleep(0)
    
    
    @app.get("/")
    async def main():
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Fri Feb 27 19:12:46 GMT 2026
    - 319 bytes
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  4. docs/zh/docs/advanced/async-tests.md

    在测试中能够使用异步函数可能会很有用,比如当您需要异步查询数据库的时候。想象一下,您想要测试向 FastAPI 应用程序发送请求,然后验证您的后端是否成功在数据库中写入了正确的数据,与此同时您使用了异步的数据库的库。
    
    让我们看看如何才能实现这一点。
    
    ## pytest.mark.anyio { #pytest-mark-anyio }
    
    如果我们想在测试中调用异步函数,那么我们的测试函数必须是异步的。 AnyIO 为此提供了一个简洁的插件,它允许我们指定一些测试函数要异步调用。
    
    ## HTTPX { #httpx }
    
    即使您的 **FastAPI** 应用程序使用普通的 `def` 函数而不是 `async def` ,它本质上仍是一个 `async` 异步应用程序。
    
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Fri Mar 20 17:06:37 GMT 2026
    - 3.9K bytes
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  5. docs/en/docs/advanced/async-tests.md

    Let's look at how we can make that work.
    
    ## pytest.mark.anyio { #pytest-mark-anyio }
    
    If we want to call asynchronous functions in our tests, our test functions have to be asynchronous. AnyIO provides a neat plugin for this, that allows us to specify that some test functions are to be called asynchronously.
    
    ## HTTPX { #httpx }
    
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Thu Mar 05 18:13:19 GMT 2026
    - 3.8K bytes
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  6. tests/test_list_bytes_file_order_preserved_issue_14811.py

    """
    Regression test: preserve order when using list[bytes] + File()
    See https://github.com/fastapi/fastapi/discussions/14811
    Fixed in PR: https://github.com/fastapi/fastapi/pull/14884
    """
    
    from typing import Annotated
    
    import anyio
    import pytest
    from fastapi import FastAPI, File
    from fastapi.testclient import TestClient
    from starlette.datastructures import UploadFile as StarletteUploadFile
    
    
    def test_list_bytes_file_preserves_order(
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Tue Feb 10 12:14:38 GMT 2026
    - 1.4K bytes
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  7. tests/test_stream_cancellation.py

    Ref: https://github.com/fastapi/fastapi/issues/14680
    """
    
    from collections.abc import AsyncIterable
    
    import anyio
    import pytest
    from fastapi import FastAPI
    from fastapi.responses import StreamingResponse
    
    pytestmark = [
        pytest.mark.anyio,
        pytest.mark.filterwarnings("ignore::pytest.PytestUnraisableExceptionWarning"),
    ]
    
    
    app = FastAPI()
    
    
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Fri Feb 27 18:56:47 GMT 2026
    - 2.7K bytes
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  8. docs/ja/docs/advanced/async-tests.md

    テストで非同期関数を使えると、たとえばデータベースへ非同期にクエリする場合などに便利です。非同期データベースライブラリを使いながら、FastAPI アプリにリクエストを送り、その後バックエンドが正しいデータをデータベースに書き込めたかを検証したい、といったケースを想像してください。
    
    その方法を見ていきます。
    
    ## pytest.mark.anyio { #pytest-mark-anyio }
    
    テスト内で非同期関数を呼び出したい場合、テスト関数自体も非同期である必要があります。AnyIO はこれを実現するための便利なプラグインを提供しており、特定のテスト関数を非同期で呼び出すことを指定できます。
    
    ## HTTPX { #httpx }
    
    **FastAPI** アプリケーションが通常の `def` 関数を使っていても、その内側は依然として `async` アプリケーションです。
    
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Fri Mar 20 14:07:17 GMT 2026
    - 4.5K bytes
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  9. fastapi/.agents/skills/fastapi/references/streaming.md

    def stream_image_no_async_no_annotation():
        with read_image() as image_file:
            yield from image_file
    ```
    
    prefer this over returning a `StreamingResponse` directly:
    
    ```python
    # DO NOT DO THIS
    
    import anyio
    from fastapi import FastAPI
    from fastapi.responses import StreamingResponse
    from app.utils import read_image
    
    app = FastAPI()
    
    
    class PNGStreamingResponse(StreamingResponse):
        media_type = "image/png"
    
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Sun Mar 01 10:05:57 GMT 2026
    - 2.5K bytes
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  10. fastapi/.agents/skills/fastapi/references/other-tools.md

    ## ty
    
    If ty is available, use it to check types.
    
    ## Asyncer
    
    When needing to run blocking code inside of async functions, or async code inside of blocking functions, suggest using Asyncer.
    
    Prefer it over AnyIO or asyncio.
    
    Install:
    
    ```bash
    uv add asyncer
    ```
    
    Run blocking sync code inside of async with `asyncify()`:
    
    ```python
    from asyncer import asyncify
    from fastapi import FastAPI
    
    Created: Sun Apr 05 07:19:11 GMT 2026
    - Last Modified: Sun Mar 01 10:05:57 GMT 2026
    - 1.5K bytes
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