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https://issues.apache.org/jira/browse/HTTPCLIENT-1482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18031124#comment-18031124
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Nathan Bryant commented on HTTPCLIENT-1482:
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[~olegk] "because it can't" is quite a bold–and \{_}incorrect{_}–statement.
`Expect: continue` is a defined part of the protocol, and conforming servers
will support it, so "abuse" is in the eye of the beholder here.
This was requested at a time when I was dealing with 3rd party servers (outside
of my control) that had issues with reachability and responsiveness. So to some
extent this would be a debugging feature, to be turned on only when necessary
(it obviously adds a round-trip), but the thinking when I requested this was
that for a connection that has been cached for some time, it can be useful to
confirm reachability, before sending a non-idempotent request, to reduce the
probability of getting into a situation where you don't know whether a server
received and acted on a request that can't necessarily be retried cleanly.
> 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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