[jetty-users] Jetty 12.1 ResourceHandler: how to know if client closed H

[Michał Niklas <michal.niklas@xxxxxxxxxx>]

Hi,

My application uses Jetty 12.1 and extends ResourceHandler to serve some 
types of data from database.

Unfortunately some queries are very long: they create big PDF, XLS, or 
CSV files and sometimes client closes browser, or Kubernetes monitor 
resends query. I wanted to know if the client is still connected. I 
tried technique like:

public boolean handle(Request request, Response response, Callback 
callback){
    request.addFailureListener(failure -> {
        log.error("Failure during serving " + request.getHttpURI() + " 
" + failure.toString() + " " + getState());
    });
    ...
}

My test query last few minutes so I can close browser during this 
period. Every long lasting query after 30 seconds writes to log:

... java.util.concurrent.TimeoutException: Idle timeout expired: 
30000/30000 ms STARTED

The query is completed regardless if I close browser (HTTP 1.1 by Chrome 
or curl) or wait for whole response. If I close browser or Ctrl-C for 
curl, there is no info that client closed connection.

I would like to know if client closed connection to simply stop querying 
database and stop creating output. How can I do it?

PS I have asked this question also on StackOverflow:
https://stackoverflow.com/questions/79979650/jetty-12-1-resourcehandler-how-to-know-if-client-closed-http-connection


--
Best regards,
Michal Niklas