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From Ortwin Glück (JIRA) <j...@apache.org>
Subject [jira] Resolved: (HTTPCLIENT-886) Incorrect handling of NoHttpResponseException in DefaultHttpMethodRetryHandler
Date Wed, 04 Nov 2009 13:25:32 GMT

     [ https://issues.apache.org/jira/browse/HTTPCLIENT-886?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Ortwin Glück resolved HTTPCLIENT-886.

    Resolution: Invalid

isRequestSent() doesn't mean that the request has actually reached the server.

> Incorrect handling of NoHttpResponseException in DefaultHttpMethodRetryHandler
> ------------------------------------------------------------------------------
>                 Key: HTTPCLIENT-886
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-886
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>    Affects Versions: 3.1 Final
>            Reporter: Sylvain Laurent
>            Priority: Critical
>             Fix For: 3.1.1
> We have a buggy load-balancer that sometimes forwards the request to the back-end server,
and then close the connections without returning any data at all.
> This provokes a NoHttpResponseException inside commons http client 3.1, which is handled
by DefaultHttpMethodRetryHandler.
> Unfortunately DefaultHttpMethodRetryHandler handles this NoHttpResponseException by asking
for a retry. In our case, this is very dangerous because the request has already been sent
and is being processed by the back-end server.
> I think that in the case of a NoHttpResponseException the test !method.isRequestSent()
shoud be done :
>         if (exception instanceof NoHttpResponseException && !method.isRequestSent())
>             // Retry if the server dropped connection on us AND the request was not sent
>             return true;
>         }

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