pagespeed/ngx_pagespeed — pull request #28 by jeffkaufman (2012-11-07 21:40:03+00:00)
Title: Respect ModPagespeed=off

One of the things you can do with headers or query params is turn off mod pagespeed:

curl -D- 'http://localhost:8050/mod_pagespeed_example/combine_css.html'
curl -D- 'http://localhost:8050/mod_pagespeed_example/combine_css.html?ModPagespeed=off'

We weren't respecting this fully before, still removing the etag, dropping the content length, etc.