Hi. We have a Drupal 8 site, using nginx and Adv/Agg with typical settings.
Our server never returns 304 response codes to requests for html documents, even if the etag is unchanged. It always returns a 200 response.
The server will return 304s for image files, css, js, pdf etc. But never for html requests.
Can someone tell us whether this is expected behavior?
If it is expected behavior - why? Isn't the purpose of the etags to support revalidation?
If it is not expected behavior, any suggestions for troubleshooting would be appreciated.