code: def store_magic_envelope_doc(self, payload):
          
          try:
              json_payload = json.loads(decode_if_bytes(payload))
          except ValueError:
              # XML payload
              xml = unquote(decode_if_bytes(payload))
              xml = xml.lstrip().encode("utf-8")
              logger.debug("diaspora.protocol.store_magic_envelope_doc: xml payload: %s", xml)
              self.doc = etree.fromstring(xml)
          else:
              logger.debug("diaspora.protocol.store_magic_envelope_doc: json payload: %s", json_payload)
              self.doc = self.get_json_payload_magic_envelope(json_payload)
docs: Get the Magic Envelope, trying JSON first.