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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def replay_checker(self, callback):
 """ Decorate a method that receives the request headers and returns a bool indicating whether we should proceed with the request. This can be used to protect against replay attacks. For example, this method could check the request date header value is within a delta value of the server time. """

        if not callback or not callable(callback):
            raise Exception("Please pass in a callable that protects against replays")
        self.replay_checker_callback = callback
        return callback