```Python hl_lines="58-66  69-72  90"
    {!> ../../../docs_src/security/tutorial003.py!}
    ```

!!! info
    The additional header `WWW-Authenticate` with value `Bearer` we are returning here is also part of the spec.

    Any HTTP (error) status code 401 "UNAUTHORIZED" is supposed to also return a `WWW-Authenticate` header.

    In the case of bearer tokens (our case), the value of that header should be `Bearer`.

* Dem `username`.
* Dem `password`.
* Einem optionalen `scope`-Feld als langem String, bestehend aus durch Leerzeichen getrennten Strings.
* Einem optionalen `grant_type` („Art der Anmeldung“).

!!! tip "Tipp"
    Die OAuth2-Spezifikation *erfordert* tatsächlich ein Feld `grant_type` mit dem festen Wert `password`, aber `OAuth2PasswordRequestForm` erzwingt dies nicht.

* Ouvrez maintenant le fichier de configuration de MkDocs pour l'anglais à

```
docs/en/docs/mkdocs.yml
```

* Trouvez l'endroit où cette `docs/features.md` se trouve dans le fichier de configuration. Quelque part comme :

```YAML hl_lines="8"
site_name: FastAPI
# More stuff
nav:
- FastAPI: index.md
- Languages:
  - en: /
  - es: /es/
- features.md
```

    val requestBody: RequestBody = "".toRequestBody(null)
    var part: MultipartBody.Part = MultipartBody.Part.create(null, requestBody)
    part = MultipartBody.Part.create(headersOf(), requestBody)
    part = MultipartBody.Part.create(requestBody)
    part = MultipartBody.Part.createFormData("", "")
    part = MultipartBody.Part.createFormData("", "", requestBody)
    part = MultipartBody.Part.createFormData("", null, requestBody)

 *  Fix: Update the stored timestamp on conditional cache hits.
 *  New: Optimized HTTP/2 request header encoding. More headers are HPACK-encoded and string
    literals are now Huffman-encoded.
 *  New: Expose `Part` headers and body in `Multipart`.
 *  New: Make `ResponseBody.string()` and `ResponseBody.charStream()` BOM-aware. If your HTTP
    response body begins with a [byte order mark][bom] it will be consumed and used to select a

In this scenario, each one of the cleaners (including you) would be a processor, doing their part of the job.

And as most of the execution time is taken by actual work (instead of waiting), and the work in a computer is done by a <abbr title="Central Processing Unit">CPU</abbr>, they call these problems "CPU bound".

---

## About HTTP status codes

!!! note
    If you already know what HTTP status codes are, skip to the next section.

In HTTP, you send a numeric status code of 3 digits as part of the response.

These status codes have a name associated to recognize them, but the important part is the number.

In short:

* `100` and above are for "Information". You rarely use them directly.  Responses with these status codes cannot have a body.

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