[contents] Skip caching if the remote server requests no caching (#945)
[contents] Skip caching if the remote server requests no caching (#945)

* Skip caching if Cache-Control defines no-cache
* Skip caching if Cache-Control defines no-store

ORelio/rss-bridge,ORelio/rss-bridge,kranack/rss-bridge,simonbru/rss-bridge,kranack/rss-bridge,kranack/rss-bridge,kranack/rss-bridge,Riduidel/rss-bridge,Riduidel/rss-bridge,RSS-Bridge/rss-bridge,Frenzie/rss-bridge,ORelio/rss-bridge,Frenzie/rss-bridge,sebsauvage/rss-bridge,RSS-Bridge/rss-bridge,Riduidel/rss-bridge,RSS-Bridge/rss-bridge,simonbru/rss-bridge