code: def get_compute(self, compute_id):
          
          try:
              return self._computes[compute_id]
          except KeyError:
              if compute_id == "vm":
                  raise aiohttp.web.HTTPNotFound(text="You try to use a node on the GNS3 VM server but the GNS3 VM is not configured")
              raise aiohttp.web.HTTPNotFound(text="Compute ID {} doesn't exist".format(compute_id))
docs: Returns a compute server or raise a 404 error.