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I was following the instructions here to set up mod_pagespeed as a proxy for my phone. As the security note suggested, I set up OpenVPN and got that much working on my phone, but OpenVPN isn't letting any traffic through to the internet. Ideally, the traffic would go to the internet via mod_pagespeed running in an Apache proxy server on the same machine, so my workflow would involve simply connecting to the proxy on my phone and then using the phone's browser as normal, except that it's being run through my mod_pagespeed proxy.
I'll gladly take a link to the docs: I looked pretty hard, but I couldn't find anything. I'm interested in configuration instructions specific to OpenVPN.