For example, Google login uses OpenID Connect (which underneath uses OAuth2).

But Facebook login doesn't support OpenID Connect. It has its own flavor of OAuth2.

### OpenID (not "OpenID Connect")

There was also an "OpenID" specification. That tried to solve the same thing as **OpenID Connect**, but was not based on OAuth2.

So, it was a complete additional system.

It is not very popular or used nowadays.

## OpenAPI

  idTokens: "3h"

  # Options for controlling the logger.
  logger:
    level: "debug"
    format: "text" # can also be "json"

# Default values shown below
oauth2:
  # use ["code", "token", "id_token"] to enable implicit flow for web-only clients
  responseTypes: [ "code", "token", "id_token" ] # also allowed are "token" and "id_token"
  # By default, Dex will ask for approval to share data with application

In diesem Fall handhabt jedoch dieselbe **FastAPI**-Anwendung sowohl die API als auch die Authentifizierung.

Betrachten wir es also aus dieser vereinfachten Sicht:

* Der Benutzer gibt den `username` und das `password` im Frontend ein und drückt `Enter`.

   * printing space backward on the same printing line. (Applicable also to display devices.)
   *
   * @since 8.0
   */
  public static final byte BS = 8;

  /**
   * Horizontal Tabulation ('\t'): A format effector which controls the movement of the printing
   * position to the next in a series of predetermined positions along the printing line.
   * (Applicable also to display devices and the skip function on punched cards.)
   *

`Manager.RegisterXHandler(handlerID, handler, subroutes...)`.

A `Handler()` function provides an HTTP handler, which should be hooked up to the appropriate route on the server.

On startup, the manager will start connecting to remotes and also starts listening for incoming connections.
Until a connection is established, all outgoing requests will return `ErrDisconnected`.

# Usage

## Single Payload Requests

   * <i>partial order</i> over ranges. There exists a unique {@linkplain Range#all maximal} range
   * according to this relation, and also numerous {@linkplain #isEmpty minimal} ranges. Enclosure
   * also implies {@linkplain #isConnected connectedness}.
   */
  public boolean encloses(Range<C> other) {
    return lowerBound.compareTo(other.lowerBound) <= 0

```Python hl_lines="9"
{!> ../../docs_src/query_params_str_validations/tutorial001.py!}
```

////

The query parameter `q` is of type `Union[str, None]` (or `str | None` in Python 3.10), that means that it's of type `str` but could also be `None`, and indeed, the default value is `None`, so FastAPI will know it's not required.

/// note

FastAPI will know that the value of `q` is not required because of the default value `= None`.

        scope: Annotated[
            str,
            Form(),
            Doc(
                """
                A single string with actually several scopes separated by spaces. Each
                scope is also a string.

                For example, a single string with:

                ```python
                "items:read items:write users:read profile openid"
                ````

proporcionado no es válido",badCVV:"CVV proporcionado no es válido",wrongFileDim:"Las dimensiones de la imagen no son validas,",imageTooTall:"el alto de la imagen no puede ser mayor a",imageTooWide:"el ancho de la imagen no puede ser mayor a",imageTooSmall:"la imagen es demasiado pequeña",min:"min.",max:"máx.",imageRatioNotAccepted:"La proporción de imagen (alto x ancho) no es válida",passwordComplexityStart:"La contraseña debe contener al menos ",passwordComplexitySeparator:", ",passwordComplexityUppercaseInfo:"...

        You can use [the template](https://github.com/gradle/gradle-issue-reproducer) with a Gradle GitHub action set up to showcase your problem.
        In the rare cases where this is infeasible, we will also accept a detailed set of instructions.
        You can also use [Gradle Project Replicator](https://github.com/android/project-replicator) to reproduce the structure of your project.
    validations:
      required: true
  - type: input