I believe this may be more of a feature request because I'm unable to find anything in regards to this but basically I would like to utilize "304 Not Modified" responses until an ESI fragment has expired and then send a "200 OK" with the full document and updated ESI fragment.

Right now I have a parent document that has a couple ESI fragments within it. Essentially I would like to set a cache header, such as an ETag, on the parent document so that client browsers can utilize If-None-Match or If-Modified-Since and receive "304 Not Modified" instead of a 200 with the whole document thus saving bandwidth.

Is there a way to check within the VCL parent document request that an ESI fragment has expired?

I'm thinking that would allow me to update the Etag or Last-Modified headers of the parent document. However, it would also need to update the parent document cached object with these new values as well and Varnish would need to be aware of that so it doesn't send a 304 but instead a 200.

Thanks

--
Rob Olmos
EnderTech

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