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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 dispatch_request(self):
 # type: () -> Response """Method that handles request verification and routing. This method can be used as a function to register on the URL rule. The request is verified through the registered list of verifiers, before invoking the request handlers. The method returns a JSON response for the Alexa service to respond to the request. :return: The skill response for the input request :rtype: flask.Response :raises: :py:class:`werkzeug.exceptions.MethodNotAllowed` if the method is invoked for other than HTTP POST request. :py:class:`werkzeug.exceptions.BadRequest` if the verification fails. :py:class:`werkzeug.exceptions.InternalServerError` for any internal exception. """

        if flask_request.method != "POST":
            raise exceptions.MethodNotAllowed()

        try:
            content = flask_request.data.decode(
                verifier_constants.CHARACTER_ENCODING)
            response = self._webservice_handler.verify_request_and_dispatch(
                http_request_headers=flask_request.headers,
                http_request_body=content)

            return jsonify(response)
        except VerificationException:
            current_app.logger.error(
                "Request verification failed", exc_info=True)
            raise exceptions.BadRequest(
                description="Incoming request failed verification")
        except AskSdkException:
            current_app.logger.error(
                "Skill dispatch exception", exc_info=True)
            raise exceptions.InternalServerError(
                description="Exception occurred during skill dispatch")