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I found this documentation to control them (not sure if htaccess can override the httpd.conf in this case)
but I don't completely understand how browsers/proxies use them?
Stuff like this only confuses me further:
Thanks for any help!
The ETag value is used in cache management to save network bandwidth.I'm inclined to think that it will be up to each browser/proxy to decide if or how to use ETags. Perhaps some "conventions" will or have emerged as to their use but I have no idea where to look or how to find them.
From your other link:
An ETag is an HTTP response header returned by an HTTP/1.1 compliant Web server such as Apache 1.3x.ETags are "new." They first became available with the HTML/1.1 spec.
Apache must auto-integrate the two (or my host has some options doing this).
Etags seem to show the file size and time as an origination stamp, so maybe the proxies/caches can determine when to update if they ignore the expires info?
Oh and apparently I *can* override their display and format in htaccess.