cache revalidation of variants does not update original variant entry
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Key: HTTPCLIENT-1032
URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1032
Project: HttpComponents HttpClient
Issue Type: Bug
Components: Cache
Affects Versions: 4.1 Beta1
Reporter: Jon Moore
Priority: Minor
Attachments: variant-entry-update-test.patch
When the cache stories multiple variant entries due to Vary headers in
responses, the cache correctly sends a conditional request containing the etags
of any existing variants on a "variant miss" (incoming request does not match
the request variants already cached). In addition, when it receives a 304
response, it correctly returns the indicated variant to the request that causes
the variant miss. However, it does not update the pre-existing variant cache
entry as recommended by RFC 2616.
For example:
request 1, User-Agent: agent1 results in a 200 OK with Etag: etag1 and Vary:
User-Agent.
request 2, User-Agent: agent2 causes an If-None-Match to the origin; if it
returns 304 Not Modified with Etag: etag1
request 3, User-Agent: agent1 results in a 200 OK but gets the (outdated) entry
that resulted from request 1
in other words, the origin response from request 2 does not update the variant
for "agent1".
This does not cause incorrect behavior (this is a SHOULD) but does miss out on
some caching opportunities here.
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