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I am hoping someone can advise on the proper method for getting Varnish to send cache-control headers. Currently, my configuration is sending "Cache-Control: no-cache" to clients.
Thanks in advance to anyone who might be able to help...
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Varnish will, in the default configuration, not cache an object coming from the backend with a 'Set-Cookie' header present. Also, if the client sends a Cookie header, Varnish will bypass the cache and go directly to the backend.
Without the cache control header the browser requests the resource every time it loads a new(?) page.
Varnish ignores Cache-Control: nocache as per the documentation. Here is evidence confirming that:
http://drupal.org/node/1418908
To get that result, you should detect the header Cache-Control .nocache. from your backend, and then invalidate the cache, set the backend response to not cacheable, or issue max-age: 0 in the other header (I forget the name right now).
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[ivy] has good advice, and/but it gets a little complicated when you try to obey a servers intent for end user (browser) caching. I found this resource to be helpful in understanding a way to configure Varnish to hold onto a cache longer than a browser is instructed to...
https://www.varnish-cache.org/trac/wiki/VCLExampleLongerCaching
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