I've spent some time going through the code for _newclient.py with the addition of the changes for 4330. I have been trying to find a way to incorporate checking for no response from an agent.request I am using the sample code of response.py in the ''using web client' howto in the twisted docs as a simple basis to do some testing I have set up a test server that will not respond for a given time so I can see what my request will do. What I can't do is work out where on the request deferred I add my callback for the _canceller method in http11clientprotocol in _newclient. Or have I got that completely wrong. Nor how I can then call this canceller method on the callback to get it to fire if the timeout has been exceeded It seems that the agent.request wraps the http11 Request so I am unclear where things are happening I'm a bit stuck .And I think I'm missing the obvious in some way. If someone has an example of how I might setup the calls I would be very happy to see it. Thanks for any info. John Aherne