### FastAPI Data Filtering

Now, for FastAPI, it will see the return type and make sure that what you return includes **only** the fields that are declared in the type.

Warning: this is a very simple server. For development, use mkdocs serve instead.
This is here only to preview a site with translations already built.
Make sure you run the build-all command first.
Serving at: http://127.0.0.1:8008
```

</div>

#### Translation specific tips and guidelines

* Translate only the Markdown documents (`.md`). Do not translate the code examples at `./docs_src`.

    assert response.json() == {
        "name": "Foo",
        "price": 50.5,
        "description": "Some Foo",
        "tax": 0.3,
    }


@needs_py310
def test_post_with_only_name(client: TestClient):
    response = client.post("/items/", json={"name": "Foo"})
    assert response.status_code == 422
    assert response.json() == IsDict(
        {
            "detail": [
                {

    )
    assert response.status_code == 200
    assert response.json() == {
        "name": "Foo",
        "price": 50.5,
        "description": "Some Foo",
        "tax": 0.3,
    }


def test_post_with_only_name(client: TestClient):
    response = client.post("/items/", json={"name": "Foo"})
    assert response.status_code == 422
    assert response.json() == IsDict(
        {
            "detail": [
                {

And it shows their true commitment to FastAPI and its **community** (you), as they not only want to provide you a **good service** but also want to make sure you have a **good and healthy framework**, FastAPI. 🙇

It had the best performance benchmarks at the time (only surpassed by Starlette).

At first, it didn't have an automatic API documentation web UI, but I knew I could add Swagger UI to it.

## About proxies with a stripped path prefix

Keep in mind that a proxy with stripped path prefix is only one of the ways to configure it.

Probably in many cases the default will be that the proxy doesn't have a stripped path prefix.

    collected using form data (instead of JSON) and that it should have the specific
    fields `username` and `password`.

    All the initialization parameters are extracted from the request.

    The only difference between `OAuth2PasswordRequestFormStrict` and
    `OAuth2PasswordRequestForm` is that `OAuth2PasswordRequestFormStrict` requires the
    client to send the form field `grant_type` with the value `"password"`, which

    **FastAPI** doesn't enforce any specific meaning.

    The information here is presented as a guideline, not a requirement.

    For example, when using GraphQL you normally perform all the actions using only `POST` operations.

### Step 4: define the **path operation function**

This is our "**path operation function**":

* **path**: is `/`.
* **operation**: is `get`.

    response = client.put(
        "/items/bar?token=jessica", headers={"X-Token": "fake-super-secret-token"}
    )
    assert response.status_code == 403, response.text
    assert response.json() == {"detail": "You can only update the item: plumbus"}


def test_admin(client: TestClient):
    response = client.post(
        "/admin/?token=jessica", headers={"X-Token": "fake-super-secret-token"}
    )