Is it possible to get %{filename_effective without transmitting
the file?  I'm trying to make the ETag name pend on that,
something like:
"--etag-compare  %{filename_effectiv.etag"

So far, the best I can do is perform a trial fetch, directing
the output to a read-only directory, failing but returning
%{filename_ effective and using that in the real fetch.

is there a server-side TOCTTOU timing hazard?  I'm imagining
a busy server which:
o declines to send a resource because of ETag match
o Updates the resource concurrently
o returns the ETag matching the new version.

The server should not return an ETag in the headers
different from the one which caused it not to send
a resource.

--
Thanks,
gil

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