[FIXED] how to use allow origin regex pattern in jupyter lab config

Issue

Hi I am trying to configure jupyter lab to only allow access from certain IPs. I know that I can set c.ServerApp.allow_origin = '*' in the config file at ~/.jupyter/jupyter_lab_config.py but I worry that this is to broad.

The docs mention the option ServerApp.allow_origin_pat which accepts a regex to allow only matching origins. Unfortunately they dont mention what regex syntax they are using. If for example I want to restrict access to localhost, 127.0.0.1, 192.39.* I would use the following regex with the python syntax: 192\.39\.\d+\.\d+|localhost|127\.0\.0\.1. However when starting jupyter lab will complain as follows:

[E 2022-08-24 11:09:54.311 LabApp] Exception while loading config file /home/user/.jupyter/jupyter_lab_config.py
    Traceback (most recent call last):
      File "/home/user/miniconda3/envs/optuna_raytune/lib/python3.9/site-packages/traitlets/config/application.py", line 738,
 in _load_config_files
        config = loader.load_config()
      File "/home/user/miniconda3/envs/optuna_raytune/lib/python3.9/site-packages/traitlets/config/loader.py", line 614, in l
oad_config
        self._read_file_as_dict()
      File "/home/user/miniconda3/envs/optuna_raytune/lib/python3.9/site-packages/traitlets/config/loader.py", line 646, in _
read_file_as_dict
        exec(compile(f.read(), conf_filename, 'exec'), namespace, namespace)
      File "/home/user/.jupyter/jupyter_lab_config.py", line 605
        1xtra arguments that will be passed to Jinja environment.
         ^
    SyntaxError: invalid syntax

So my question is, how do I construct a correct regex?

Solution

Your error is "1xtra" on line 605 in file "/home/user/.jupyter/jupyter_lab_config.py". You need to comment that line out (and optionally correct the miss-spelling). Also, be aware that all of the 127/8 block is localhost.

Answered By - Andrew