Re: [users@httpd] Re: ETAG and Vary with reverse proxy and xsendfile

[Eric Covener]

> (I'm still unsure if sending valid ETags is sufficient to make
> If-None-Match work, i.e. whether the checking for that is up or
> downstream of where mod_xsendfile sits - any comments anyone?)

Yes, this is the part that that's relevant:
https://github.com/nmaier/mod_xsendfile/blob/master/mod_xsendfile.c#L558
If there was a valid ETAG at this point, it would trigger the
conditional request handling.  It looks like preceding this line the
module is trying to get the core to set the same ETAG it would have
set if serving the static file directly.

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[users@httpd] Re: ETAG and Vary with reverse proxy and xsendfile

[Phil Endecott]

Yesterday I asked:

2. mod_xsendfile (see https://github.com/nmaier/mod_xsendfile)
sends the specified file to the client.



Currently, all responses seem to have ETAG: "0". I'd like
the ETAG to be based in the normal way on the attributes
of the file that mod_xsendfile actually sends.



I believe I've found a bug in mod_xsendfile that explains this.

This module doesn't seem to have had much attention from its author
for a number of years, yet it does provide a useful feature (which
some other servers have built-in). Has Apache ever considered
adopting this module, or otherwise adding this functionality?

(I'm still unsure if sending valid ETags is sufficient to make
If-None-Match work, i.e. whether the checking for that is up or
downstream of where mod_xsendfile sits - any comments anyone?)


Regard, Phil.





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