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From "Oleg Kalnichevski (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HTTPCLIENT-1493) Conditional stale connection checking
Date Wed, 04 Jun 2014 08:36:01 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-1493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14017497#comment-14017497

Oleg Kalnichevski commented on HTTPCLIENT-1493:

I see. However, please note the compatibility code (check every time) will still be present
at the client level and does not need to be implemented in the connection pool. 

Does this kind of check make sense in general? I kind of doubt.


> Conditional stale connection checking
> -------------------------------------
>                 Key: HTTPCLIENT-1493
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1493
>             Project: HttpComponents HttpClient
>          Issue Type: New Feature
>            Reporter: Sebb
>             Fix For: 4.4 Final
> Stale connection checking is expensive. At present if it is enabled, it is performed
for every connection. This is quite expensive and generates additional requests.
> One reason for a server to drop a connection is when the connection has been idle for
a while. Some servers send Keep-Alive headers to inform the client of this; if they don't,
then the client will see an unexpected disconnection. Stale connection checking avoids this
problem, but at the cost of additional requests. When a connection is not busy, this is acceptable,
but for a busy connection the checks are mostly unnecessary.
> Another reason for dropping a connection is after it has been reused many times. The
server should send a connection close as part of the final response, but if it does not, a
stale check would help.
> For these reasons, it would be useful to be able to implement conditional stale connection
checking, based on connection idle time and/or connection reuse count. These conditions should
be optionally selectable.

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