* filer: match If-Match and If-None-Match against "*" and ETag lists
checkPreconditions compared the whole header as one ETag, so "*", a
list of ETags and a weak W/ tag in If-None-Match never matched
(RFC 9110 13.1.1, 13.1.2).
* volume: check If-None-Match before If-Modified-Since and match ETag lists
A volume GET answered 304 from If-Modified-Since even when If-None-Match
named a different ETag, and compared If-None-Match as one exact string,
so "*", lists and weak tags never matched (RFC 9110 13.1.2, 13.2.2).
* filer: split etag lists only outside quoted tags
A comma inside a quoted opaque tag is a legal etagc, not a list
separator; strings.Split cut such tags into fragments that
CanonicalizeETag could turn into a false match.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
* filer: match repeated If-Match and If-None-Match header lines
Header.Get reads only the first field line, so a match on a later
repeated header was missed; join all field values like any other
comma-separated list.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
* volume: match repeated If-None-Match header lines
Header.Get reads only the first field line; join all field values so a
match on a later repeated header is seen. Also covers a comma inside a
quoted opaque tag.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
* volume: send the etag on a 304 like the filer does
RFC 9110 15.4.5 lists ETag among the fields a 304 must carry when a 200
would send it; SetEtag now runs before the notModified check.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
* volume: mirror the conditional-GET fixes in the rust server
not_modified_response now checks If-None-Match before If-Modified-Since,
matches "*", weak tags, quoted commas and repeated field lines through
the same list rules, and sends the etag on a 304.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
* volume: treat an empty If-None-Match like the Go server does
* filer: ignore empty elements in etag precondition lists
* volume: ignore empty elements in etag lists like the filer
* filer: let a present-but-empty precondition line suppress the date check
* volume: gate If-Modified-Since on a present If-None-Match line
* volume: gate If-Modified-Since on header presence like the Go server
---------
Co-authored-by: user.email <chrislusf@users.noreply.github.com>
Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: chrislusf <chris.lu@gmail.com>
