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https://issues.apache.org/jira/browse/CXF-7404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Freeman Yue Fang reassigned CXF-7404:
-------------------------------------
Assignee: Freeman Yue Fang
> The GZIP feature should set Vary: Accept-Encoding always
> --------------------------------------------------------
>
> Key: CXF-7404
> URL: https://issues.apache.org/jira/browse/CXF-7404
> Project: CXF
> Issue Type: Bug
> Components: Transports
> Affects Versions: 3.1.11
> Reporter: Frode Austvik
> Assignee: Freeman Yue Fang
> Priority: Minor
>
> At the moment, {{Accept-Encoding}} is added to the {{Vary}} header by
> {{[GZIPOutInterceptor.GZipThresholdOutputStream|https://github.com/apache/cxf/blob/cxf-3.1.11/core/src/main/java/org/apache/cxf/transport/common/gzip/GZIPOutInterceptor.java#L300]}}
> only when the content is actually being compressed, while it should also be
> added to responses that _could_ have been compressed if the client accepted
> gzip encoding - at least according to my reading of [RFC 7231 (section
> 7.1.4)|https://tools.ietf.org/html/rfc7231#section-7.1.4]:
> {quote}
> An origin server SHOULD send a Vary header field when its algorithm
> for selecting a representation varies based on aspects of the request
> message other than the method and request target,
> {quote}
> I think the main underlying reason for this is that, otherwise, a cache might
> get stuck serving a sub-optimal variant - in our case sending uncompressed
> data to clients that support gzip, as we're not telling it that a compressed
> variant is also available.
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