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https://issues.apache.org/jira/browse/HTTPCLIENT-1482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18031138#comment-18031138
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Oleg Kalnichevski commented on HTTPCLIENT-1482:
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> "because it can't" is quite a bold–and incorrect–statement
[~nbryant] Please take a look the HTTP specification with regards to the
purpose and intent of the `expect: continue` handshake. Please also note that
not sending request body does not make POST requests safe or idempotent.
Oleg
> ability to expect-continue only if potentially stale
> ----------------------------------------------------
>
> Key: HTTPCLIENT-1482
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1482
> Project: HttpComponents HttpClient
> Issue Type: Wish
> Components: HttpClient (classic)
> Reporter: Nathan Bryant
> Priority: Minor
> Fix For: 5.6-alpha1
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> If the stale check fails, non-idempotent queries such as POST can return a
> "no response from server" error to the application stack, resulting in
> ambiguity as to whether the request was received and acted on in some fashion
> by the host, possibly resulting in a server-side error.
> Might be nice as a RequestConfig option to be able to enable the
> expect-continue handshake only for cases where the connection was recycled
> from a pool.
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