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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 get_director_backend(self, service_id, version_number, director_name, backend_name):
 		"""Returns the relationship between a Backend and a Director. If the Backend has been associated with the Director, it returns a simple record indicating this. Otherwise, returns a 404."""

		content = self._fetch("/service/%s/version/%d/director/%s/backend/%s" % (service_id, version_number, director_name, backend_name), method="GET")
		return FastlyDirectorBackend(self, content)