Change Details

According to Google's best practices for mobile sites[1], a page that serves different html to different devices, should set the Vary header to User-Agent (or add it to the list of existing Vary headers) to allow the google bot (and possibly other third party cache infrastructures) to know, that the content (or the delivered html) varies when different user agents/devices are used. Currently, MobileFrontend doesn't set this header at all, but should, if the `$wgMFAutodetectMobileView` config variable is set to true and `$wgMobileUrlTemplate` is '' or false (with that configuration, the same url is used for different html, mobile and desktop one). [1] https://developers.google.com/webmasters/mobile-sites/mobile-seo/dynamic-serving?hl=en#the-vary-http-header