use JSON instead of XML in Subsonic API

backend/mediaprovider/subsonic/subsonicmediaprovider.go

@@ -53,7 +53,7 @@ func (s *subsonicMediaProvider) GetLibraries() ([]mediaprovider.Library, error)
 		return nil, err
 	}
 	return sharedutil.MapSlice(folders, func(f *subsonic.MusicFolder) mediaprovider.Library {
-		return mediaprovider.Library{ID: f.ID, Name: f.Name}
+		return mediaprovider.Library{ID: strconv.Itoa(f.ID), Name: f.Name}
 	}), nil
 }
 

backend/servermanager.go

@@ -220,6 +220,7 @@ func (s *ServerManager) connect(connection ServerConnection, password string) (m
 				User:         connection.Username,
 				PasswordAuth: connection.LegacyAuth,
 				ClientName:   res.AppName,
+				UseJSON:      true,
 			},
 		}
 		s.checkSetInsecureSkipVerify(connection.SkipSSLVerify, cli.(*subsonicMP.SubsonicServer).Client.Client)
@@ -231,6 +232,7 @@ func (s *ServerManager) connect(connection ServerConnection, password string) (m
 				User:         connection.Username,
 				PasswordAuth: connection.LegacyAuth,
 				ClientName:   res.AppName,
+				UseJSON:      true,
 			},
 		}
 		s.checkSetInsecureSkipVerify(connection.SkipSSLVerify, altCli.(*subsonicMP.SubsonicServer).Client.Client)