mod_pagespeed
cannot rewrite HTTPS resources by default, you have to explicitly enable it by one of these options:
ModPagespeedMapOriginDomain
- to tellmod_pagespeed
to fetch HTTPS resources using HTTPModPagespeedLoadFromFile
- to tellmod_pagespeed
to load HTTPS resources directly from the filesystem.ModPagespeedFetchHttps
- to tellmod_pagespeed
to fetch HTTPS resources directly.ModPagespeedFetchFromModSpdy
- if you havemod_spdy
installed, to fetch resources using it.
The documentation has more details: https://developers.google.com/speed/pagespeed/module/https_support