+ static const char NOTIFY_ALL_OBSERVERS_FAILED[] = "notifyAllObservers failed";
+ static const char NOTIFY_LIST_OBSERVERS_FAILED[] = "notifyListOfObservers failed";
+ static const char METHOD_NOT_ALLOWED[] = "method not allowed";
+ static const char NOT_IMPLEMENTED[] = "not implemented";
+ static const char BAD_GATEWAY[] = "bad gateway";
+ static const char SERVICE_UNAVAILABLE[] = "service not available";
+ static const char GATEWAY_TIMEOUT[] = "gateway timeout";
+ static const char PROXY_NOT_SUPPORTED[] = "proxy not supported";