def unbind(self, event, callback):
        self._emitter.unsubscribe(event, callback)
Returns the cache expiration duration to be users for the given file.
dataset/ETHPy150Open benoitc/gaffer/gaffer/httpclient/websocket.py/GafferSocket.unbind--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/tools/dev_appserver.py/StaticFileConfigMatcher.GetExpiration