jupyterlab/binder/jupyter_notebook_config.py

common = [
    "--no-browser",
    "--debug",
    "--port={port}",
    "--ServerApp.ip=127.0.0.1",
    '--ServerApp.token=""',
    # Disable dns rebinding protection here, since our 'Host' header
    # is not going to be localhost when coming from hub.mybinder.org
    "--ServerApp.allow_remote_access=True",
]

lab_command = " ".join(
    [
        "jupyter",
        "lab",
        "--dev-mode",
        "--extensions-in-dev-mode",
        "--collaborative",
        "--ServerApp.base_url={base_url}lab-dev",
    ]
    + common
    + [">jupyterlab-dev.log 2>&1"]
)


lab_splice_command = " ".join(
    [
        "jupyter",
        "lab",
        "build",
        "--splice-source",
        "--minimize=False",
        "--dev-build=True",
        "--debug",
        ">jupyterlab-spliced.log 2>&1",
        "&&",
        "jupyter",
        "lab",
        "--ServerApp.base_url={base_url}lab-spliced",
    ]
    + common
    + [">jupyterlab-spliced.log 2>&1"]
)


c.ServerProxy.servers = {
    "lab-dev": {"command": ["/bin/bash", "-c", lab_command], "timeout": 60, "absolute_url": True},
    "lab-spliced": {
        "command": ["/bin/bash", "-c", lab_splice_command],
        "timeout": 300,
        "absolute_url": True,
    },
}

c.NotebookApp.default_url = "/lab-dev"

import logging

c.NotebookApp.log_level = logging.DEBUG