* This is typical for Java but atypical for HTTP/2. This is motivated by exception transparency:
 * an [IOException] that was triggered by a certain caller can be caught and handled by that caller.
 */
@Suppress("NAME_SHADOWING")
class Http2Connection internal constructor(builder: Builder) : Closeable {
  internal val lock: ReentrantLock = ReentrantLock()

- Visit <http://localhost:8080>, login will direct the user to the Google OAuth2 Auth URL to obtain a permission grant.
- The redirection URI (callback handler) receives the OAuth2 callback, verifies the state parameter, and obtains a Token.
- Using the id_token the callback handler further talks to Google OAuth2 Token URL to obtain an JWT id_token.

## Accessing the request body in an exception handler

!!! tip
    To solve this same problem, it's probably a lot easier to use the `body` in a custom handler for `RequestValidationError` ([Handling Errors](../tutorial/handling-errors.md#use-the-requestvalidationerror-body){.internal-link target=_blank}).

    opt raise
        dep -->> handler: Raise HTTPException
        handler -->> client: HTTP error response
        dep -->> dep: Raise other exception
    end
    dep ->> operation: Run dependency, e.g. DB session
    opt raise
        operation -->> dep: Raise HTTPException
        dep -->> handler: Auto forward exception
        handler -->> client: HTTP error response

	}

	// We fake a local and remote server.
	remoteHost := remote.HostName()
	handler := NewStream[*testRequest, *testRequest, *testResponse](handlerTest, newTestRequest, newTestRequest, newTestResponse)
	handler.InCapacity = 1
	handler.OutCapacity = 1
	const payloads = 10

	// 1: Echo
	register := func(manager *Manager) {

			closer.Close()
		}
	})
}

// NoAuthMiddleware no auth middle ware.
func NoAuthMiddleware(h http.Handler) http.Handler {
	return h
}

// AuthMiddleware checks if the bearer token is valid and authorized.
func AuthMiddleware(h http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

        requestBody.put("handler_name", handlerName);
        requestBody.put("boost", id);
        requestBody.put("available", true);
        requestBody.put("sort_order", id);
        return requestBody;
    }

    @Override
    protected Map<String, Object> getUpdateMap() {
        final Map<String, Object> updateMap = new HashMap<>();
        updateMap.put("handler_name", "CsvDataStore");
        return updateMap;

    opt raise
        dep -->> handler: Raise HTTPException
        handler -->> client: HTTP error response
        dep -->> dep: Raise other exception
    end
    dep ->> operation: Run dependency, e.g. DB session
    opt raise
        operation -->> dep: Raise HTTPException
        dep -->> handler: Auto forward exception
        handler -->> client: HTTP error response

import org.apache.maven.api.Type;
import org.apache.maven.api.services.TypeRegistry;
import org.apache.maven.artifact.handler.ArtifactHandler;
import org.apache.maven.artifact.handler.DefaultArtifactHandler;
import org.apache.maven.eventspy.AbstractEventSpy;
import org.apache.maven.execution.ExecutionEvent;

import static java.util.Objects.requireNonNull;

/**
 */
@Named
@Singleton

### Eine benutzerdefinierte `GzipRoute`-Klasse erstellen

Als Nächstes erstellen wir eine benutzerdefinierte Unterklasse von `fastapi.routing.APIRoute`, welche `GzipRequest` nutzt.

Dieses Mal wird die Methode `APIRoute.get_route_handler()` überschrieben.

Diese Methode gibt eine Funktion zurück. Und diese Funktion empfängt einen Request und gibt eine Response zurück.

Hier verwenden wir sie, um aus dem ursprünglichen Request einen `GzipRequest` zu erstellen.