def __init__(self, callback, method_frame):
        self._callback = callback
        self._method_frame = method_frame
Checks if there is an entity tag match.
dataset/ETHPy150Open pika/pika/pika/adapters/blocking_connection.py/_ConnectionBlockedUnblockedEvtBase.__init__--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/tools/dev_appserver.py/FileDispatcher._CheckETagMatches