Am 03.10.2016 um 13:18 schrieb Arnold Maderthaner:
I have an issue with my TS setup. My use case is that I want to cache images in TS and keep them for a very long time and only go back to origin if needed (which is indicated by the client request). Caching basically works for me if I set proxy.config.http.cache.required_headers=0 as my origin server doesn't supply lifetime values. My issue is that sometimes the images changes and than I need to get a fresh copy from origin. So I tried to use "Cache Control:no-cache" header to obtain a new copy but TS still gives me the old version. I cannot use any time based triggers to obtain a new copy from origin as the images are more or less static (99% of the time) but there are exceptions where the client specifies with the Cache Control header to revalidate the data with origin
why don't you just define a short expire on the origin since when it's reached ATS verifies with the ETAG header from the origin if it needs to fetch again and if not the repsonse is just a "304 Not Modified" without any body or overhead?
"keep them for a very long time and only go back to origin if needed" sounds like a very broken concept
<IfModule mod_expires.c> ExpiresActive On ExpiresByType text/css A30 ExpiresByType text/javascript A30 ExpiresByType application/javascript A30 ExpiresByType application/x-javascript A30 ExpiresByType text/plain A30 ExpiresByType text/xml A30 ExpiresByType application/xhtml+xml A30 ExpiresByType application/xml A30 ExpiresByType image/jpeg A60 ExpiresByType image/jpg A60 ExpiresByType image/gif A60 ExpiresByType image/png A60 ExpiresByType text/html A60 ExpiresByType text/comma-separated-values A60 ExpiresByType text/tab-separated-values A60 </IfModule>
