Retry on ConnectionException

[Riad Souissi <rs...@stc.com.sa>]

Hi,

I noticed that the Retry handler mechanism does not work when the client
cannot initiate a connection (which throws
java.net.ConnectionException).
This happens for me for instance when there is proxy and a tunneling in
the picture and sometimes there are connectivity problems.
Of course, it is possible to build the retry on top of the HTTPClient,
but it would be nice to use the same RetryHandler framework for that.

I believe a ConnectionException is a typical transiant error that can be
retried safely for those who want to enable it.
Any opinion ?

thanks
riad


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Re: Retry on ConnectionException

[Oleg Kalnichevski <ol...@apache.org>]

Riad,

Per default HttpClient does not automatically retry requests upon
connection timeout. However, nothing prevents you from providing a
custom retry handler to override this behavior:

public class DefaultHttpMethodRetryHandler 
  implements HttpMethodRetryHandler {

...
    public boolean retryMethod(
        final HttpMethod method, 
        final IOException exception, 
        int executionCount) {

...
        if (executionCount > this.retryCount) {
            // Do not retry if over max retry count
            return false;
        }
        if (exception instanceof NoHttpResponseException) {
            // Retry if the server dropped connection on us
            return true;
        }
        if (exception instanceof InterruptedIOException) {
            // Timeout
            return false; // return true instead
        }
...
        // otherwise do not retry
        return false;
    }

See <http://jakarta.apache.org/commons/httpclient/3.0/exception-
handling.html#Custom%20exception%20handler> for details

Cheers,

Oleg


On Mon, 2005-02-14 at 16:21 +0300, Riad Souissi wrote:
> Hi,
> 
> I noticed that the Retry handler mechanism does not work when the client
> cannot initiate a connection (which throws
> java.net.ConnectionException).
> This happens for me for instance when there is proxy and a tunneling in
> the picture and sometimes there are connectivity problems.
> Of course, it is possible to build the retry on top of the HTTPClient,
> but it would be nice to use the same RetryHandler framework for that.
> 
> I believe a ConnectionException is a typical transiant error that can be
> retried safely for those who want to enable it.
> Any opinion ?
> 
> thanks
> riad
> 
> 
> DiscalimerThe information in this email and in any files transmitted with it,
> is intended only for the addressee and may contain confidential and/or privileged material.
> Access to this email by anyone else is unauthorized. If you receive this in error,
> please contact the sender immediately and delete the material from any computer.
> If you are not the intended recipient, any disclosure, copying, distribution or
> any action taken or omitted to be taken in reliance on it, is strictly prohibited.
> Statement and opinions expressed in this e-mail are those of the sender, and do not
> necessarily reflect those of STC.


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