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https://issues.apache.org/jira/browse/CXF-4231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13248431#comment-13248431
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Sergey Beryozkin commented on CXF-4231:
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It appears to me that "the compare the tags first, and check the dates only if
the tags match" is very reasonable and as you said it's the most typical case
where the pair of these headers is used, we can definitely enhance the code if
there is a more accepted approach toward handling the other combinations :-)
> Incorrect handling of "If-None-Match" and "If-Modified-Since" request header
> combination
> ----------------------------------------------------------------------------------------
>
> Key: CXF-4231
> URL: https://issues.apache.org/jira/browse/CXF-4231
> Project: CXF
> Issue Type: Bug
> Components: JAX-RS
> Affects Versions: 2.5
> Reporter: Jan Engehausen
> Assignee: Sergey Beryozkin
> Fix For: 2.3.10, 2.4.7, 2.5.3, 2.6
>
>
> I have a case where I set both a (weak) "ETag" and a "Last-Modified" response
> header. I noticed
> that javax.ws.rs.core.Request.evaluatePreconditions(Date, EntityTag)
> unexpectedly returns a
> response builder with status code 304 when the ETags differ but the last
> modified dates are
> identical. This is because after the failing check against the ETag the
> current code simply performs
> the check against the timestamp. According to RFC 2616, section 14.26
> (http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html):
> "If none of the entity tags match, then the server MAY perform the requested
> method as if the If-None-Match header field did not exist, but MUST also
> ignore any If-Modified-Since header field(s) in the request. That is, if no
> entity tags match, then the server MUST NOT return a 304 (Not Modified)
> response."
> This is currently not the case.
>
> This code change works for my case, but some deeper thought needs to be given
> to possible
> request header combinations (If-Match/If-None-Match and If-Modified-Since):
>
> public ResponseBuilder evaluatePreconditions(Date lastModified, EntityTag
> eTag) {
> final ResponseBuilder rb = evaluatePreconditions(eTag);
> if (rb != null) {
> // the ETag conditions match; so now conditions for last modified
> must match
> return evaluatePreconditions(lastModified);
> } else {
> // the ETag conditions do not match, so last modified should be
> ignored
> // see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
> (section 14.26 for
> // "If-None-Match", behavior not specified for "If-Match",
> section 14.24)
> return null;
> }
> }
>
> I assume that the most typical behavior for a browser is to send
> If-None-Match and If-Modified-Since,
> and this case is currently not working.
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