def _remove_io_handler(self, handler):
        if handler not in self.io_handlers:
            return
        self.io_handlers.remove(handler)
        for thread in self.io_threads:
            if thread.io_handler is handler:
                thread.stop()
Adds the request host to the continue url if no host is specified.
dataset/ETHPy150Open kuri65536/python-for-android/python3-alpha/python-libs/pyxmpp2/mainloop/threads.py/ThreadPool._remove_io_handler--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/user_service_stub.py/UserServiceStub._AddHostToContinueURL