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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 verify_request_and_dispatch( self, http_request_headers, http_request_body):
 # type: (Dict[str, Any], str) -> str """Entry point for webservice skill invocation. This method takes in the input request headers and request body, handles the deserialization of the input request to the :py:class:`ask_sdk_model.request_envelope.RequestEnvelope` object, run the input through registered verifiers, invoke the skill and return the serialized response from the skill invocation. :param http_request_headers: Request headers of the input request to the webservice :type http_request_headers: Dict[str, Any] :param http_request_body: Raw request body of the input request to the webservice :type http_request_body: str :return: Serialized response object returned by the skill instance, when invoked with the input request :rtype: str :raises: :py:class:`ask_sdk_core.exceptions.AskSdkException` when skill deserialization, verification, invocation or serialization fails """

        request_envelope = self._skill.serializer.deserialize(
            payload=http_request_body, obj_type=RequestEnvelope)

        for verifier in self._verifiers:
            verifier.verify(
                headers=http_request_headers,
                serialized_request_env=http_request_body,
                deserialized_request_env=request_envelope)

        response_envelope = self._skill.invoke(
            request_envelope=request_envelope, context=None)

        return self._skill.serializer.serialize(response_envelope)