https://bz.apache.org/bugzilla/show_bug.cgi?id=57661

--- Comment #3 from Tobias Oberlies <tobias.oberl...@sap.com> ---
Sorry for the redundant comments.

I have an addition to my analysis in comment #1:
> ... (e.g. the Apache httpclient). These clients could
> send only headers plus the "Expect: 100-continue" and would then see an
> error response (e.g. 403)

With this enhancement implemented, there would be benefit, but it would be
limited. The benefit would be that the client sees the response instead of an
exception.

What we wouldn't get with the Apache 4.x httpclient is that the connection can
be reused for the next request. The problem is that because the httpclient
doesn't send the last chunk of the (to be discarded) entity after seeing a
final response to its "Expect: 100-continue" request. This forces the server to
close the connection. Apparently, this was only fixed in the 5.x httpclient [1]

[1] https://issues.apache.org/jira/browse/HTTPCORE-411

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