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From "Oleg Kalnichevski (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HTTPCLIENT-1684) 100-Continue support broken
Date Mon, 07 Sep 2015 14:20:45 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-1684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14733763#comment-14733763
] 

Oleg Kalnichevski commented on HTTPCLIENT-1684:
-----------------------------------------------

Section 8.2.2 (Monitoring Connections for Error Status Messages) has _nothing_ to do with
the expect-continue handshake. HttpClient does not support this recommendation (defined by
SHOULD requirement) due to limitations of the Java classic (blocking) i/o, which has been
discussed numerous times on the dev and user list. Async version of HttpClient fully supports
this requirement.

I'll close this issue as invalid unless you can substantiate how exactly 100-continue is broken.

Oleg

> 100-Continue support broken
> ---------------------------
>
>                 Key: HTTPCLIENT-1684
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1684
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpClient
>    Affects Versions: 4.5
>         Environment: Linux Mint 17.2, Oracle Java 8 u60
>            Reporter: Piotr Kołaczkowski
>
> Handling of Expect: 100-Continue is partially broken.
> After getting the Expect header, the server is allowed to:
> 1. respond with an HTTP 100 Continue status 
> 2. respond with HTTP 417 Expectation Failed status
> 3. respond with the final HTTP answer, typically an error.
> Handling of situation 1. seems to work ok. I haven't checked the scenario 2. But scenario
3. is broken, at least when using chunked transfer encoding.
> {quote}
> 8.2.2 Monitoring Connections for Error Status Messages
> An HTTP/1.1 (or later) client sending a message-body SHOULD monitor the network connection
for an error status while it is transmitting the request. If the client sees an error status,
it SHOULD immediately cease transmitting the body. If the body is being sent using a "chunked"
encoding (section 3.6), a zero length chunk and empty trailer MAY be used to prematurely mark
the end of the message. If the body was preceded by a Content-Length header, the client MUST
close the connection. 
> {quote}
> The problem is that HttpClient does *not* send the last chunk in this case, nor terminates
the connection, nor continues sending the body which are the only options allowed by the specs.
Instead it just happily returns the response to the user and doesn't send anything to the
server, keeping the connection open. This breaks subsequent requests on this connection, since
a standard-compliant server would expect the request body and would interpret any subsequent
HTTP status line as an entity chunk instead of a new request.
> Debugging this is unfortunately quite hard, since many of the servers got this wrong
either and they just close the connection in this case (which is not entirely correct because
the HTTP specs requires the *client* to close the connection not the server).



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