Fix confusing terminal output when using ServerApp.ip=0.0.0.0

[Yann-P]

Pointed out in jupyterlab/jupyterlab#15520,

When using --ip=:: or 0.0.0.0, terminal displays:

    Or copy and paste one of these URLs:
        http://xxx.local:8888/lab?token=xxx
        http://127.0.0.1:8888/lab?token=xxx

Which makes it look like it does not listen on all interfaces, but in fact it does.

After this fix:

    Or copy and paste one of these URLs:
        http://0.0.0.0:8888/?token=xxx
        http://127.0.0.1:8888/?token=xxx

Fixed with #743 in mind to avoid a regression in k8s.

Steps to test

jupyter server --ip 0.0.0.0

And check for no regressions on jupyter server --ip "", jupyter server --ip 127.0.0.1, jupyter server --ip <arbitrary ip>

These are unit-tested too.

AI disclosure

Claude code, only to dig up the history of previous changes to avoid a regression.

[minrk]

0.0.0.0 is not generally a connectable ip, so it shouldn't be included in a "connect" list, since copy & paste will generally not work. But it should be clear that the separate bits of information:

1. "Jupyter Server is running at http://0.0.0.0:8888" (good!)
2. "You can connect at http://hostname:port" (should not include 0.0.0.0)

This PR fixes the Jupyter Server 2.15.0 is running at: log, but the copy and paste one of these URLs shouldn't include 0.0.0.0, but could maybe be more explicit with something like "any hostname/ip of your system, such as..." and still include hostname

[Yann-P]

Thank you for reviewing.

Fixed in b62505c

The output is now

(jupyter-server) jupyter_server fix-0000* % jupyter server --ip 0.0.0.0
[I 2026-05-29 15:20:57.018 ServerApp] jupyter_server_terminals | extension was successfully linked.
[I 2026-05-29 15:20:57.041 ServerApp] jupyter_server_terminals | extension was successfully loaded.
[I 2026-05-29 15:20:57.042 ServerApp] Serving notebooks from local directory: /Users/yann/oss/jupyter_server
[I 2026-05-29 15:20:57.042 ServerApp] Jupyter Server 2.20.0.dev0 is running at:
[I 2026-05-29 15:20:57.042 ServerApp] http://0.0.0.0:8888/?token=...
[I 2026-05-29 15:20:57.042 ServerApp]     http://127.0.0.1:8888/?token=...
[I 2026-05-29 15:20:57.042 ServerApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[I 2026-05-29 15:20:57.042 ServerApp] Welcome to Project Jupyter! Explore the various tools available and their corresponding documentation. If you are interested in contributing to the platform, please visit the community resources section at https://jupyter.org/community.html.
[C 2026-05-29 15:20:57.043 ServerApp]

    To access the server, open this file in a browser:
        file:///Users/yann/Library/Jupyter/runtime/jpserver-93845-open.html
    Or copy and paste one of these URLs:
        http://yanns-MacBook-Pro.local:8888/?token=...
               ^^^^^^^^^^^^^^^^^^^^^^^
        http://127.0.0.1:8888/?token=...
    The server is listening on all interfaces, so any hostname or IP of this machine will work.
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

[minrk]

Great, thank you!