update tests, forward failed basic auth to render correct error body

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

proxy/pkg/middleware/account_uuid.go

@@ -99,8 +99,11 @@ func AccountUUID(opts ...Option) func(next http.Handler) http.Handler {
 							Iss: opt.OIDCIss,
 						}
 					} else {
+						// we are still forwarding the request, the service is responsible for rendering the error
+						// TODO or render a full blown ocs xml / json error response
+						next.ServeHTTP(w, r)
 						// tell client to reauthenticate
-						w.WriteHeader(http.StatusUnauthorized)
+						//w.WriteHeader(http.StatusUnauthorized)
 						return
 					}
 				} else {