'Initialize a ThrottledHttpRpcServerFactory.
Args:
throttle: A Throttle instance to use for the ThrottledHttpRpcServer.
throttle_class: A class to use instead of the default
ThrottledHttpRpcServer.
Returns:
A factory to produce a ThrottledHttpRpcServer.'

def __init__(self, throttle, throttle_class=None):

    self.throttle = throttle
    self.throttle_class = throttle_class
