java - Serve an already-gzipped response from a Servlet -

i have gzipped json resource in application want serve via servlet. browsers disagree on why, none of them load content. wrong code?

public class myservlet extends httpservlet {     @override     protected void doget(httpservletrequest req, httpservletresponse resp) throws servletexception, ioexception {         resp.setstatus(200);          inputstream in = <get input stream gzipped data>;          resp.setintheader("content-length", in.available());         outputstream out = resp.getoutputstream();          out.write(ioutils.tobytearray(in));         out.close();          resp.setheader("content-encoding", "gzip");         resp.setheader("content-type", "application/json");     } } 

i think answer looking available in link in accepted answer in thread - serve gzipped content java servlets.

this includes working example o'reilly site.

however question need introducing cross curling concern , gzip contents manually. assuming using apache or fork thereof, suggest @ mod_deflate configurable , powerful , releases need write boilerplate code gzipping responses.