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compat/maven-model-builder/src/main/java/org/apache/maven/model/interpolation/reflection/ReflectionValueExtractor.java

                        + "seems is an instance of '%s'",
                expression.subSequence(from, to), from, value.getClass());

        throw new IntrospectionException(message);
    }

    private static Object getIndexedValue(
            final String expression, final int from, final int to, final Object value, final String indexStr)
            throws IntrospectionException {
        try {

Created: Sun Dec 28 03:35:09 GMT 2025

- Last Modified: Tue Feb 25 08:27:34 GMT 2025

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github.com/tiangolo/fastapi

docs_src/additional_responses/tutorial004_py39.py

from typing import Union

from fastapi import FastAPI
from fastapi.responses import FileResponse
from pydantic import BaseModel


class Item(BaseModel):
    id: str
    value: str


responses = {
    404: {"description": "Item not found"},
    302: {"description": "The item was moved"},
    403: {"description": "Not enough privileges"},
}


app = FastAPI()


@app.get(
    "/items/{item_id}",

Created: Sun Dec 28 07:19:09 GMT 2025

- Last Modified: Wed Dec 17 20:41:43 GMT 2025

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github.com/tiangolo/fastapi

docs/en/docs/tutorial/response-model.md

With this, we get tooling support, from editors and mypy as this code is correct in terms of types, but we also get the data filtering from FastAPI.

How does this work? Let's check that out. 🤓

### Type Annotations and Tooling { #type-annotations-and-tooling }

First let's see how editors, mypy and other tools would see this.

Created: Sun Dec 28 07:19:09 GMT 2025

- Last Modified: Sat Dec 20 15:55:38 GMT 2025

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github.com/tiangolo/fastapi

tests/test_tutorial/test_custom_response/test_tutorial009.py

from pathlib import Path

from fastapi.testclient import TestClient

from docs_src.custom_response import tutorial009_py39
from docs_src.custom_response.tutorial009_py39 import app

client = TestClient(app)


def test_get(tmp_path: Path):
    file_path: Path = tmp_path / "large-video-file.mp4"
    tutorial009_py39.some_file_path = str(file_path)
    test_content = b"Fake video bytes"
    file_path.write_bytes(test_content)

Created: Sun Dec 28 07:19:09 GMT 2025

- Last Modified: Wed Dec 17 20:41:43 GMT 2025

- 502 bytes

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github.com/tiangolo/fastapi

docs_src/additional_status_codes/tutorial001_an_py39.py

from typing import Annotated, Union

from fastapi import Body, FastAPI, status
from fastapi.responses import JSONResponse

app = FastAPI()

items = {"foo": {"name": "Fighters", "size": 6}, "bar": {"name": "Tenders", "size": 3}}


@app.put("/items/{item_id}")
async def upsert_item(
    item_id: str,
    name: Annotated[Union[str, None], Body()] = None,
    size: Annotated[Union[int, None], Body()] = None,
):
    if item_id in items:

Created: Sun Dec 28 07:19:09 GMT 2025

- Last Modified: Sat Mar 18 12:29:59 GMT 2023

- 705 bytes

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github.com/tiangolo/fastapi

docs_src/body_multiple_params/tutorial004_py39.py

from typing import Union

from fastapi import Body, FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: Union[str, None] = None
    price: float
    tax: Union[float, None] = None


class User(BaseModel):
    username: str
    full_name: Union[str, None] = None


@app.put("/items/{item_id}")
async def update_item(
    *,
    item_id: int,

Created: Sun Dec 28 07:19:09 GMT 2025

- Last Modified: Wed Dec 17 20:41:43 GMT 2025

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github.com/tiangolo/fastapi

tests/test_openapi_model_description_trim_on_formfeed.py

from fastapi import FastAPI
from fastapi.testclient import TestClient
from pydantic import BaseModel

app = FastAPI()


class MyModel(BaseModel):
    """
    A model with a form feed character in the title.
    \f
    Text after form feed character.
    """


@app.get("/foo")
def foo(v: MyModel):  # pragma: no cover
    pass


client = TestClient(app)


def test_openapi():

Created: Sun Dec 28 07:19:09 GMT 2025

- Last Modified: Tue Jun 17 07:46:27 GMT 2025

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github.com/tiangolo/fastapi

tests/test_tutorial/test_websockets/test_tutorial001.py

import pytest
from fastapi.testclient import TestClient
from fastapi.websockets import WebSocketDisconnect

from docs_src.websockets.tutorial001_py39 import app

client = TestClient(app)


def test_main():
    response = client.get("/")
    assert response.status_code == 200, response.text
    assert b"<!DOCTYPE html>" in response.content


def test_websocket():
    with pytest.raises(WebSocketDisconnect):

Created: Sun Dec 28 07:19:09 GMT 2025

- Last Modified: Wed Dec 17 20:41:43 GMT 2025

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github.com/tiangolo/fastapi

tests/test_security_http_base_description.py

from fastapi import FastAPI, Security
from fastapi.security.http import HTTPAuthorizationCredentials, HTTPBase
from fastapi.testclient import TestClient

app = FastAPI()

security = HTTPBase(scheme="Other", description="Other Security Scheme")


@app.get("/users/me")
def read_current_user(credentials: HTTPAuthorizationCredentials = Security(security)):
    return {"scheme": credentials.scheme, "credentials": credentials.credentials}

Created: Sun Dec 28 07:19:09 GMT 2025

- Last Modified: Mon Nov 24 19:03:06 GMT 2025

- 2K bytes

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github.com/tiangolo/fastapi

docs_src/security/tutorial002_py39.py

from typing import Union

from fastapi import Depends, FastAPI
from fastapi.security import OAuth2PasswordBearer
from pydantic import BaseModel

app = FastAPI()

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")


class User(BaseModel):
    username: str
    email: Union[str, None] = None
    full_name: Union[str, None] = None
    disabled: Union[bool, None] = None


def fake_decode_token(token):
    return User(

Created: Sun Dec 28 07:19:09 GMT 2025

- Last Modified: Wed Dec 17 20:41:43 GMT 2025

- 755 bytes

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