I'm running a Piranha CMS based page, using it as a content source in passive mode. While working on optimizing pagespeed i saw that all image requests handled by piranha return the following response headers:
GET /media/4b3b3fa3-ff7b-4af7-81f2-168474edd23f/50/20
Cache-Control:no-cache
Content-Length:52826
Content-Type:image/jpeg
Date:Mon, 17 Nov 2014 11:53:28 GMT
Expires:-1
Pragma:no-cache
X-UA-Compatible:IE=Edge,chrome=1
Naturally, i want these images to be cached where possible. I looked around the code on github and saw that this information appears to be set in /Piranha/Web/ClientCache.cs.
Is there a way to influence the caching headers set by piranha?
The configuration section isn't all that clear in the current version but the caching is controlled by two parameters that you can set in the manager interface from System > Parameters. Here you have the two parameters CACHE_PUBLIC_EXPIRES and CACHE_PUBLIC_MAXAGE which specifies the time, in minutes, of the client browser cache.
These are set to 0 by default since you don't want cache enabled during development which disables the cache and renders the no-cache headers. When you activate the cache E-tag, Last modified & Expires headers will be generated for your media files.
Best regards
Håkan