void onWritePossible() throws IOExceptionInvoked when it it possible to write data without blocking. The container will invoke this method the first time for a request as soon as data can be written. Subsequent invocations will only occur if a call to
ServletOutputStream.isReady()has returned false and it has since become possible to write data.
IOException- if an I/O error occurs while processing this event
void onError(Throwable throwable)Invoked if an error occurs while writing the response.
throwable- The throwable that represents the error that occurred