Strip Connection and other hop-by-hop headers when saving input resource, because the underlying server will add a new Connection header.

[GoogleCodeExporter]

Received the following error on several CSS files:
Error 330 (net::ERR_CONTENT_DECODING_FAILED): Unknown error.

Receive various javascript "could not load" or parsing errors (using Chrome 
console):
Uncaught Error: Could not load 'cms.QLButton'; last tried '/js/cms/QLButton.js'
Error
Error parsing in _ContentSetter#Setter_pf_ui_dashboard_Widget_0_pane_0 
Error
 /fission/js/dojo/dojo/../dijit/layout/ContentPane.js:525
Error undefined running custom onLoad code: This deferred has already been 
resolved 

Interestingly enough the javascript parse errors are not corrected when adding 
the URL parameter: "ModPagespeed=off", but work fine when I completely shut 
mod_pagespeed off.

These errors occur only on our administrative panel, so they aren't easy to 
provide specific examples, but they basically occur on every page load & render 
our admin panel completely unusable.

What version of the product are you using (please check X-Mod-Pagespeed
header)?
X-Mod-Pagespeed: 1.4.0.0-2742

On what operating system?
Arch Linux

Which version of Apache?
Apache/2.2.24

Which MPM?
Prefork

URL of broken page:
http://www.healthlinksgolf.org/fission/js/dojo/dijit/themes/claro/TitlePane_rtl.
css (this is the example URL of one the regularly receives the 330 content 
decoding error, but it will not currently break since I've been force to turn 
off mod_pagespeed on this server)

Original issue reported on code.google.com by mwhe...@360psg.com on 4 Apr 2013 at 8:15