Hi, ETag (http://en.wikipedia.org/wiki/HTTP_ETag) was created to allow the verification if the content has changed without even downloading it. It would be smart to a cache like Varnish to check the ETag of URLs at backend from time to time to check if they have changed and then the cached version and wait for a client to request it, providing a newer version of a JPEG or CSS for instance.
Does Varnish used ETag to check cache freshness? - If yes, how does it behave? - If not, is it possible to achive through VCL? Thanks in advance.
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