code: def process_exception(self, e, uuid, routing_key, body, tb=None):
          
          # get informations about message
          msg = e.message if hasattr(e, "message") else str(e)
          exception_type = str(e.__class__)
          exception_name = str(e.__class__.__name__)
  
          print "Sending exception %s: %s for UUID %s." % (
              exception_name,
              msg,
              uuid
          )
  
          self.sendMessage(
              self.output_exchange,
              routing_key,
              str(body),
              properties=pika.BasicProperties(
                  content_type="application/text",
                  delivery_mode=2,
                  headers={
                      "exception": msg,
                      "exception_type": exception_type,
                      "exception_name": exception_name,
                      "traceback": tb,
                      "UUID": uuid
                  }
              )
          )
docs: Callback called when exception was raised.
  
          This method serializes the exception and sends it over AMQP back
          to caller.
  
          Args:
              e (obj): Instance of the exception.
              uuid (str): UUID of the message that caused the exception to raise.
              routing_key (str): Which routing key was used.
              body (str): Body of the exception - the longer text.
              tb (str, default None): Traceback (stacktrace)v of the exception.