Agent timeout example

gistfile1.py

def fetch(...,  clock=None):
    if clock is None:
        from twisted.internet import reactor as clock

    def handleResponse(response):
        # ...

    d = agent.request(method, url, Headers(h), body)
    call = clock.callLater(timeout, d.cancel)
    def cancelTimeout(result):
        if call.active():
            call.cancel()
        return result
    d.addCallback(handleResponse)
    d.addBoth(cancelTimeout)
    return d