onError abstract method

void onError(void onError(HttpConnect? connect, Object error, StackTrace? stackTrace)?)

The application-specific error handler to listen all uncaught errors

• that ever happen in this server.
• If the connect argument is null, it means it is a server error,
• or a uncaught error happening in an asynchronous operation.
• If not null, it means it is caused by an event handler or an event filter.
• Notice: all uncaught error will be handled automatically, such as
• closing up the connection, if any, and log the error message,
• Thus, you rarely need to register an error handler.
• Once onError is assigned, the default logging will be disabled,
• i.e., it is onError's job to log it.

Implementation

void onError(void onError(HttpConnect? connect, Object error, StackTrace? stackTrace)?);