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https://issues.apache.org/jira/browse/HTTPCLIENT-1920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16458579#comment-16458579
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Oleg Kalnichevski commented on HTTPCLIENT-1920:
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[~jonm] Do you think you might have a few minutes to take a look at the pull
request? I'll happily do all the leg work.
Oleg
> Cached HEAD requests without response body
> ------------------------------------------
>
> Key: HTTPCLIENT-1920
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1920
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient (classic)
> Affects Versions: 4.4.1, 4.5
> Reporter: Tobias Gesellchen
> Priority: Major
> Labels: pull-request-available
>
> Since httpclient-cache 4.4 {{HEAD}} requests can be cached with a {{null}}
> response body. Subsequent {{GET}} requests to the same target then use the
> headers "If-None-Match" and "If-Modified-Since" to leverage caching via HTTP
> protocol. In that case a server can respond with status code 304 and an empty
> response body, which leads to an invalid cache entry.
> The GitHub PR #101 proposes a fix, which I have tested locally. The PR is
> based on httpclient-cache 4.5, but should easily be backported to 4.4. I
> haven't looked into the upcoming 5.x sources, yet.
>
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