**FastAPI** will **extract** the data for **each field** from the **headers** in the request and give you the Pydantic model you defined.

## Check the Docs { #check-the-docs }

You can see the required headers in the docs UI at `/docs`:

<div class="screenshot">
<img src="/img/tutorial/header-param-models/image01.png">
</div>

## Forbid Extra Headers { #forbid-extra-headers }

////

## Terms used in the docs { #terms-used-in-the-docs }

//// tab | Test

* you
* your

* e.g.
* etc.

* `foo` as an `int`
* `bar` as a `str`
* `baz` as a `list`

* the Tutorial - User guide
* the Advanced User Guide
* the SQLModel docs
* the API docs
* the automatic docs

* Data Science

    dependency.

    Read more about it in the
    [FastAPI docs for HTTP Basic Auth](https://fastapi.tiangolo.com/advanced/security/http-basic-auth/).
    """

    username: Annotated[str, Doc("The HTTP Basic username.")]
    password: Annotated[str, Doc("The HTTP Basic password.")]


class HTTPAuthorizationCredentials(BaseModel):
    """

    context = browser.new_context(viewport={"width": 960, "height": 1080})
    page = context.new_page()
    page.goto("http://localhost:8000/docs")
    page.get_by_role("button", name="POST /data Post Data").click()
    # Manually add the screenshot
    page.screenshot(path="docs/en/docs/img/tutorial/json-base64-bytes/image01.png")

    # ---------------------
    context.close()
    browser.close()

Exécutez maintenant la commande `fastapi` :

<div class="termy">

```console
$ fastapi dev

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

Et ouvrez la documentation à [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs).

        doc.put("floatStr", "123.45");
        assertEquals(Float.valueOf(123.45f), DocumentUtil.getValue(doc, "floatStr", Float.class));

        doc.put("boolStr", "true");
        assertEquals(Boolean.TRUE, DocumentUtil.getValue(doc, "boolStr", Boolean.class));

        doc.put("boolStr2", "false");

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