jupyterhub
diff --git a/‎jupyterhub/apihandlers/users.py‎
Lines changed: 3 additions & 0 deletions b/‎jupyterhub/apihandlers/users.py‎
Lines changed: 3 additions & 0 deletions
diff --git a/‎jupyterhub/user.py‎
Lines changed: 2 additions & 0 deletions b/‎jupyterhub/user.py‎
Lines changed: 2 additions & 0 deletions
@@ -640,6 +640,9 @@ async def post(self, username, server_name=''):
 
  # do stuff with payload
  data = self.get_json_body()
+ self.log.debug(
+ "Callback delivered for user %s: %s", user.name, data
+        )
  if hasattr(spawner, 'spawner_callback'):
  url = spawner.spawner_callback(data)
 
 
@@ -558,9 +558,11 @@ async def spawn(self, server_name='', options=None, handler=None):
  # TODO: if we always wait for this then we are not
  # compatible with older jupyterhub-singleuser, which is
  # technically allowed but perhaps not useful.
+ self.log.debug("Waiting for spawner callback for %s", spawner._log_name)
  ret = (
  await spawner.callback_future
                 )  # spawner.callback_future.set_result(new_url)
+ self.log.debug("Spawner callback completed for %s, ret=%s", spawner._log_name, ret)
  if ret:
  url = ret
  if url: