serialization - JSF: How to capture response that is send to client -

i want implement kind of help-functionality within jsf-application

scenario:

when users of app having problems, send me screenshots. these of poor quality , cannot see information want.

my idea: add "help"-button jsf-page. when button pressed store render-response (resulting html) send client on hd.

now can open generated html-file , can see information want (e.g. values of inputfield)

now question.

how can perform task?

i have tried phaselistener , using

printwriter w = new printwriter(system.out); debugutil.simpleprinttree(facescontext.getcurrentinstance().getviewroot(),"",w);


but component tree , not resulting html

in other words: want capture output of facescontext.getexternalcontext().getresponse() send client

any ideas?

use filter around facesservlet. there define httpservletresponsewrapper , in turn make getoutputstream() , getwriter() return wrappers of original objects. in wrappers, in addition delegating original implementation, store written data somewhere else.