Apache/Nginx mod_pagespeed outline_javascript option breaks Save button on Website Domain page
When mod_pagespeed outline_javascript is enabled, unable to save changes to a website configuration in the main page. Click Sites, Website, select a site. Make an arbitrary change like changing the PHP version from Fast-CGI to Mod-PHP try to click Save. Nothing happens. Switch to the SSL tab and save works from there.
Temporary resolution: edit /etc/apache2/mods-available/pagespeed.conf and disable outline_javascript
#ModPagespeedEnableFilters outline_javascript
then reload Apache service apache reload
Background: https://developers.google.com/speed/pagespeed/module/filter-js-outline