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From alex.x.at...@jpmorgan.com
Subject Re: Attempt to implement HA with HttpClient
Date Fri, 20 May 2005 11:38:14 GMT

Thanks for your help with this issue.

Things I changed to make it work:

1. Changed the executeMethod call to take in a config param:
        from:   httpclient.executeMethod(post);
        to:     httpclient.executeMethod(manager.getHostConfiguration(), 
post); // ensure we are pointing at the right host

2. changed the isValidConnection test to release instead of close.
        from:   connection.close() 
        to:     connection.releaseConnection(); // not sure if this makes 
any difference

I think this was a logical bug on my part. I think what happened was that 
the Authentiaction was being attempted against one host, but the 
executeMehtod was against another host. Not exactly sure why the java.net.BindException: Address
already in use: connect exception was raised. Searching through the logs we found some responses

contained the tomcat 401 error - authentiaction required.

Again, thanks for your help. 

Ortwin Gl├╝ck <ortwin.glueck@nose.ch>
19/05/2005 10:27
Please respond to "HttpClient Project"

        To:     HttpClient Project <httpclient-dev@jakarta.apache.org>
        Subject:        Re: Attempt to implement HA with HttpClient

Oleg, I guess even Windows provides an API function that allocates a 
free local port automatically. I don't think that Java handles the 
allocation of the local port number in any way.


Oleg Kalnichevski wrote:
> Alex,
> This is just a guess on my part, so take it for what it is worth. The
> JVM randomly assigns a local port for an outbound connection, if the
> port has not been explicitly given. I assume most JVMs make no
> provisions to ensure that under no circumstances the same number gets
> assigned more than once. When under heavy load it is perfectly feasible
> that, while a connection is being established, the same number gets 
> assigned to another connection, thus causing BindException.
> Consider the following options:
> (1) reuse connections as much as possible to minimize odds of having to
> open new sockets
> (2) implement your own algorithm to assign local ports
> (3) simply retry Socket#bind method in case of BindException
> Hope this helps
> Oleg

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