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  2. github.com/tiangolo/fastapi

    docs/en/docs/index.md 

    <details markdown="1">
<summary>Or use <code>async def</code>...</summary>

If your code uses `async` / `await`, use `async def`:

```Python hl_lines="9  14"
from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
async def read_item(item_id: int, q: Union[str, None] = None):
    Registered: Sun Dec 28 07:19:09 UTC 2025
    - Last Modified: Thu Dec 25 11:01:37 UTC 2025
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  3. github.com/tiangolo/fastapi

    docs_src/app_testing/tutorial001_py39.py 

    from fastapi import FastAPI
from fastapi.testclient import TestClient

app = FastAPI()


@app.get("/")
async def read_main():
    return {"msg": "Hello World"}


client = TestClient(app)


def test_read_main():
    response = client.get("/")
    assert response.status_code == 200
    Registered: Sun Dec 28 07:19:09 UTC 2025
    - Last Modified: Wed Dec 17 20:41:43 UTC 2025
    - 334 bytes
    - Viewed (0)
  4. github.com/tiangolo/fastapi

    docs_src/middleware/tutorial001_py39.py 

    import time

from fastapi import FastAPI, Request

app = FastAPI()


@app.middleware("http")
async def add_process_time_header(request: Request, call_next):
    start_time = time.perf_counter()
    response = await call_next(request)
    process_time = time.perf_counter() - start_time
    response.headers["X-Process-Time"] = str(process_time)
    Registered: Sun Dec 28 07:19:09 UTC 2025
    - Last Modified: Wed Dec 17 20:41:43 UTC 2025
    - 365 bytes
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  5. github.com/tiangolo/fastapi

    tests/test_security_oauth2_authorization_code_bearer_description.py 

    app = FastAPI()

oauth2_scheme = OAuth2AuthorizationCodeBearer(
    authorizationUrl="authorize",
    tokenUrl="token",
    description="OAuth2 Code Bearer",
    auto_error=True,
)


@app.get("/items/")
async def read_items(token: Optional[str] = Security(oauth2_scheme)):
    return {"token": token}


client = TestClient(app)


def test_no_token():
    response = client.get("/items")
    Registered: Sun Dec 28 07:19:09 UTC 2025
    - Last Modified: Fri Jun 30 18:25:16 UTC 2023
    - 2.4K bytes
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  6. github.com/tiangolo/fastapi

    tests/test_security_oauth2_password_bearer_optional.py 

    from fastapi.security import OAuth2PasswordBearer
from fastapi.testclient import TestClient

app = FastAPI()

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/token", auto_error=False)


@app.get("/items/")
async def read_items(token: Optional[str] = Security(oauth2_scheme)):
    if token is None:
        return {"msg": "Create an account first"}
    return {"token": token}


client = TestClient(app)
    Registered: Sun Dec 28 07:19:09 UTC 2025
    - Last Modified: Fri Jun 30 18:25:16 UTC 2023
    - 2.1K bytes
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  7. github.com/tiangolo/fastapi

    docs_src/request_forms_and_files/tutorial001_an_py39.py 

    from typing import Annotated

from fastapi import FastAPI, File, Form, UploadFile

app = FastAPI()


@app.post("/files/")
async def create_file(
    file: Annotated[bytes, File()],
    fileb: Annotated[UploadFile, File()],
    token: Annotated[str, Form()],
):
    return {
        "file_size": len(file),
        "token": token,
        "fileb_content_type": fileb.content_type,
    Registered: Sun Dec 28 07:19:09 UTC 2025
    - Last Modified: Sat Mar 18 12:29:59 UTC 2023
    - 386 bytes
    - Viewed (0)
  8. github.com/tiangolo/fastapi

    docs_src/settings/tutorial001_pv1_py39.py 

    
class Settings(BaseSettings):
    app_name: str = "Awesome API"
    admin_email: str
    items_per_user: int = 50


settings = Settings()
app = FastAPI()


@app.get("/info")
async def info():
    return {
        "app_name": settings.app_name,
        "admin_email": settings.admin_email,
        "items_per_user": settings.items_per_user,
    Registered: Sun Dec 28 07:19:09 UTC 2025
    - Last Modified: Sat Dec 20 15:55:38 UTC 2025
    - 413 bytes
    - Viewed (0)
  9. github.com/tiangolo/fastapi

    docs_src/cookie_param_models/tutorial001_py39.py 

    app = FastAPI()


class Cookies(BaseModel):
    session_id: str
    fatebook_tracker: Union[str, None] = None
    googall_tracker: Union[str, None] = None


@app.get("/items/")
async def read_items(cookies: Cookies = Cookie()):
    Registered: Sun Dec 28 07:19:09 UTC 2025
    - Last Modified: Wed Dec 17 20:41:43 UTC 2025
    - 341 bytes
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  10. github.com/tiangolo/fastapi

    docs_src/custom_response/tutorial003_py39.py 

    from fastapi import FastAPI
from fastapi.responses import HTMLResponse

app = FastAPI()


@app.get("/items/")
async def read_items():
    html_content = """
    <html>
        <head>
            <title>Some HTML in here</title>
        </head>
        <body>
            <h1>Look ma! HTML!</h1>
        </body>
    </html>
    """
    Registered: Sun Dec 28 07:19:09 UTC 2025
    - Last Modified: Wed Dec 17 20:41:43 UTC 2025
    - 394 bytes
    - Viewed (0)
  11. github.com/tiangolo/fastapi

    docs_src/query_params/tutorial006_py39.py 

    from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/items/{item_id}")
async def read_user_item(
    item_id: str, needy: str, skip: int = 0, limit: Union[int, None] = None
):
    item = {"item_id": item_id, "needy": needy, "skip": skip, "limit": limit}
    Registered: Sun Dec 28 07:19:09 UTC 2025
    - Last Modified: Wed Dec 17 20:41:43 UTC 2025
    - 301 bytes
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