Tobias Gesellchen created HTTPCLIENT-1920:
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Summary: 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: 4.5, 4.4.1
Reporter: Tobias Gesellchen
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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