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I have some progress on the request timeout. I have something that seems to work. But I am sure I have got something wrong.. This is a copy of the response.py example with some additions to deal with request timeouts. Any chance that someone could take a look and let me know where I have gone wrong. #!/usr/bin/env python # -*- coding: UTF-8 -*- from pprint import pformat from twisted.internet import reactor from twisted.internet.defer import Deferred from twisted.internet.protocol import Protocol from twisted.web.client import Agent from twisted.web.http_headers import Headers import urllib import time class BeginningPrinter(Protocol): def __init__(self, finished): self.finished = finished self.remaining = 1024 * 10 def dataReceived(self, bytes): if self.remaining: display = bytes[:self.remaining] print 'Some data received:', bytes, 'no bytes', len(bytes) print display self.remaining -= len(display) def connectionLost(self, reason): print 'Finished receiving body:', reason.getErrorMessage() self.finished.callback(None) def do_cancel(d): print 'got do cancel' d._canceller(d) from stringprod_resp import StringProducer my_data = ['fred','ted','red','fred'] for c, a in enumerate(my_data): if c > 2: time.sleep(10) agent = Agent(reactor) #postdata = urllib.urlencode({'Username' : 'nsp05682', # 'Password' : 'rocs345', # 'Action' : 'CheckCredits'}) postdata = urllib.urlencode({'the-field' : a}) body = StringProducer(postdata) print 'body', body d = agent.request( 'POST', 'http://www.johna.com/test', Headers({'User-Agent': ['Twisted Web Client'], 'Accept-Encoding':['identity'], 'Content-Type':['application/x-www-form-urlencoded']}), body) # 'Content-Length':[str(len(postdata))], def cbRequest(response): print 'Response version:', response.version print 'Response code:', response.code print 'Response phrase:', response.phrase print 'Response headers:' print pformat(list(response.headers.getAllRawHeaders())) finished = Deferred() print 'response deliverbody',response.deliverBody response.deliverBody(BeginningPrinter(finished)) return finished d.addCallback(cbRequest) #reactor.callLater(10, check_timeout,d) #j = dir(d) #print 'later', j #print 'fff cancel', d.cancel #print 'fff canceller', d._canceller #k = dir(agent.request) #print 'kkk', k #print 'reacotcallater' #if a == 'fred': # print 'cancel ', a no_response = reactor.callLater(40, do_cancel, d) #d.cancel() def got_error(o): print 'got error', str(o) reason = dir(o) print 'got reason', o.getErrorMessage def cbShutdown(ignored, no_response): print 'got finish ignored', ignored #print 'no rsposne', no_response norep = dir(no_response) #print 'kkk', norep if no_response.cancelled: print 'already cancelled' else: print 'not cancelled' no_response.cancel() no_response = None #reactor.stop() d.addCallback(cbShutdown, no_response) d.addErrback(got_error) reactor.run()