/// tip

The *path operation* for `swagger_ui_redirect` is a helper for when you use OAuth2.

If you integrate your API with an OAuth2 provider, you will be able to authenticate and come back to the API docs with the acquired credentials. And interact with it using the real OAuth2 authentication.

Swagger UI will handle it behind the scenes for you, but it needs this "redirect" helper.

///

else
  # The volume mapping flag below shares the user's gcloud credentials, if any,
  # with the container, in case the user has credentials stored there.
  # This would allow Bazel to authenticate for RBE.
  # Note: TF's CI does not have any credentials stored there.
  TFCI_DOCKER_ARGS="$TFCI_DOCKER_ARGS -v $HOME/.config/gcloud:/root/.config/gcloud"

Let's imagine that you have your **backend** API in some domain.

And you have a **frontend** in another domain or in a different path of the same domain (or in a mobile application).

And you want to have a way for the frontend to authenticate with the backend, using a **username** and **password**.

We can use **OAuth2** to build that with **FastAPI**.

        scheme, param = get_authorization_scheme_param(authorization)
        if self.realm:
            unauthorized_headers = {"WWW-Authenticate": f'Basic realm="{self.realm}"'}
        else:
            unauthorized_headers = {"WWW-Authenticate": "Basic"}
        if not authorization or scheme.lower() != "basic":
            if self.auto_error:
                raise HTTPException(

		fmt.Println("AccessKeyID:", v.AccessKeyID)
		fmt.Println("SecretAccessKey:", v.SecretAccessKey)
		fmt.Println("SessionToken:", v.SessionToken)
		return
	}

	// Use generated credentials to authenticate with MinIO server
	stsEndpointURL, err := url.Parse(stsEndpoint)
	if err != nil {
		log.Fatalf("Error parsing sts endpoint: %v", err)
	}
	copts := &minio.Options{
		Creds:  li,

ISTIO_ZTUNNEL_BASE_URL="${ISTIO_ZTUNNEL_BASE_URL:-https://storage.googleapis.com/istio-build/ztunnel}"

# If we are not using the default, assume its private and we need to authenticate
if [[ "${ISTIO_ZTUNNEL_BASE_URL}" != "https://storage.googleapis.com/istio-build/ztunnel" ]]; then
  AUTH_HEADER="Authorization: Bearer $(gcloud auth print-access-token)"
  export AUTH_HEADER
fi

        }
        String authHeader;
        if (response == HTTP_UNAUTHORIZED) {
            authHeader = "WWW-Authenticate";
            authProperty = "Authorization";
        } else {
            authHeader = "Proxy-Authenticate";
            authProperty = "Proxy-Authorization";
        }
        String authorization = null;

{!> ../../docs_src/security/tutorial003.py!}
```

////

/// info

Der zusätzliche Header `WWW-Authenticate` mit dem Wert `Bearer`, den wir hier zurückgeben, ist ebenfalls Teil der Spezifikation.

Jeder HTTP-(Fehler-)Statuscode 401 „UNAUTHORIZED“ soll auch einen `WWW-Authenticate`-Header zurückgeben.

Im Fall von Bearer-Tokens (in unserem Fall) sollte der Wert dieses Headers `Bearer` lauten.

          <description>
            The username used to authenticate.
          </description>
          <type>String</type>
        </field>
        <field>
          <name>password</name>
          <version>1.0.0+</version>
          <description>
            The password used in conjunction with the username to authenticate.
          </description>
          <type>String</type>
        </field>

	if err != nil {
		log.Fatalln(err)
	}

	err = madmClnt.ServiceRestart(context.Background())
	if err != nil {
		log.Fatalln(err)
	}

	// Use generated credentials to authenticate with MinIO server
	minioClient, err := minio.New(stsEndpointURL.Host, opts)
	if err != nil {
		log.Fatalf("Error initializing client: %v", err)
	}

	// Use minIO Client object normally like the regular client.