Prefer to use the `Annotated` version if possible.
///
```Python hl_lines="7"
{!> ../../docs_src/request_forms/tutorial001.py!}
```
////
For example, in one of the ways the OAuth2 specification can be used (called "password flow") it is required to send a `username` and `password` as form fields.
For example, in one of the ways the OAuth2 specification can be used (called "password flow") it is required to send a `username` and `password` as form fields.