IPRO on reverse proxy can capture gzipped content and serve it to users without content-encoding:gzip

[GoogleCodeExporter]

What steps will reproduce the problem?
1. open http://www.trideal.in/?ModPagespeed=on in browser as we have disabled 
pagespeed for now
2.try different options through URL

What is the expected output? What do you see instead?
we tried enabling different options as suggested on pagespeed faq page and page 
breaks on extend_cache and inline_css 

we tried putting below line in our pagespeed.conf and restarted apache but it 
still broke
ModPagespeedDisableFilters extend_cache,inline_css

What version of the product are you using (please check X-Mod-Pagespeed
header)?
1.6.29.7-3566

On what operating system?
Linux ip-10-144-81-158 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 
2013 x86_64 x86_64 x86_64 GNU/Linux

Which version of Apache?
Server version: Apache/2.4.6 (Ubuntu)
Server built:   Dec  5 2013 18:32:22

Which MPM?
prefork

URL of broken page:
http://www.trideal.in
http://www.trideal.in/?ModPagespeed=on&PageSpeedFilters=extend_cache
http://www.trideal.in/?ModPagespeed=on&PageSpeedFilters=inline_css

Original issue reported on code.google.com by [email protected] on 27 Feb 2014 at 7:07