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https://issues.apache.org/jira/browse/HTTPCLIENT-1100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13046559#comment-13046559
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Jon Moore commented on HTTPCLIENT-1100:
---------------------------------------

By the way, I suppose this is presumed by my earlier response, but I agree this 
is a bug. The cache entry should only be considered invalid if there is a 
Content-Length header present and it does not match the length of the cached 
response body. If a Content-Length header is not present, then the entry should 
be presumed valid (at least per the sense of this test).


> Missing Content-Length header makes cached entry invalid
> --------------------------------------------------------
>
>                 Key: HTTPCLIENT-1100
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1100
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: Cache
>    Affects Versions: 4.1.1, 4.1.2, 4.2 Alpha1
>            Reporter: Bart Robeyns
>              Labels: cache, contentlength
>         Attachments: MissingContentLength.patch
>
>
> A cached entry whose original response didn't carry a Content-Length header, 
> should not be rejected for considered invalid because the length of its 
> cached content is different from the non-existing Content-Length header 
> value. The attached patch only verifies the lengths if the header was 
> originally present.

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