Does Varnish uses ETag?

Kurt Kraut listas at
Thu Jul 7 23:14:15 CEST 2011


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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