`nbdiff-web` gives error `Exception: You must define the 'login_url' setting in your application to use @tornado.web.authenticated``

[this-josh]

I have created a clean conda 3.12.2 env and installed nbdime==4.0.1.

I have then created a clean git repo, a and committed a notebook called a.ipynb. Now, after changing the notebook and running nbdiff-web a.ipynb

I get the error

[I nbdimeserver:430] Listening on 127.0.0.1, port 58036
[I webutil:29] URL: http://127.0.0.1:58036/difftool
[E web:1875] Uncaught exception GET /difftool (127.0.0.1)
HTTPServerRequest(protocol='http', host='127.0.0.1:58036', method='GET', uri='/difftool', version='HTTP/1.1', remote_ip='127.0.0.1')
Traceback (most recent call last):
  File "/private/tmp/.venv/lib/python3.12/site-packages/tornado/web.py", line 1769, in _execute
    result = await result  # type: ignore
             ^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jupyter_server/base/handlers.py", line 642, in prepare
    return web.authenticated(lambda _: super().prepare())(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/tornado/web.py", line 3289, in wrapper
    url = self.get_login_url()
          ^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/tornado/web.py", line 1443, in get_login_url
    self.require_setting("login_url", "@tornado.web.authenticated")
  File "/private/tmp/.venv/lib/python3.12/site-packages/tornado/web.py", line 1673, in require_setting
    raise Exception(
Exception: You must define the 'login_url' setting in your application to use @tornado.web.authenticated
[E web:1300] Uncaught exception in write_error
Traceback (most recent call last):
  File "/private/tmp/.venv/lib/python3.12/site-packages/tornado/web.py", line 1769, in _execute
    result = await result  # type: ignore
             ^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jupyter_server/base/handlers.py", line 642, in prepare
    return web.authenticated(lambda _: super().prepare())(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/tornado/web.py", line 3289, in wrapper
    url = self.get_login_url()
          ^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/tornado/web.py", line 1443, in get_login_url
    self.require_setting("login_url", "@tornado.web.authenticated")
  File "/private/tmp/.venv/lib/python3.12/site-packages/tornado/web.py", line 1673, in require_setting
    raise Exception(
Exception: You must define the 'login_url' setting in your application to use @tornado.web.authenticated

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/private/tmp/.venv/lib/python3.12/site-packages/jupyter_server/base/handlers.py", line 738, in write_error
    html = self.render_template("%s.html" % status_code, **ns)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jupyter_server/base/handlers.py", line 665, in render_template
    template = self.get_template(name)
               ^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jupyter_server/base/handlers.py", line 660, in get_template
    return self.settings["jinja2_env"].get_template(name)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jinja2/environment.py", line 1010, in get_template
    return self._load_template(name, globals)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jinja2/environment.py", line 969, in _load_template
    template = self.loader.load(self, name, self.make_globals(globals))
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jinja2/loaders.py", line 125, in load
    source, filename, uptodate = self.get_source(environment, name)
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jinja2/loaders.py", line 204, in get_source
    raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: 500.html

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/private/tmp/.venv/lib/python3.12/site-packages/tornado/web.py", line 1298, in send_error
    self.write_error(status_code, **kwargs)
  File "/private/tmp/.venv/lib/python3.12/site-packages/nbdime/webapp/nbdimeserver.py", line 68, in write_error
    return super(NbdimeHandler, self).write_error(status_code, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jupyter_server/base/handlers.py", line 740, in write_error
    html = self.render_template("error.html", **ns)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jupyter_server/base/handlers.py", line 665, in render_template
    template = self.get_template(name)
               ^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jupyter_server/base/handlers.py", line 660, in get_template
    return self.settings["jinja2_env"].get_template(name)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jinja2/environment.py", line 1010, in get_template
    return self._load_template(name, globals)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jinja2/environment.py", line 969, in _load_template
    template = self.loader.load(self, name, self.make_globals(globals))
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jinja2/loaders.py", line 125, in load
    source, filename, uptodate = self.get_source(environment, name)
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/jinja2/loaders.py", line 204, in get_source
    raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: error.html
[E log:97] {
  "Host": "127.0.0.1:58036",
  "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
  "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36"
}
[E log:98] 500 GET /difftool (@127.0.0.1) 22.21ms referer=None
^CTraceback (most recent call last):
  File "/private/tmp/.venv/bin/nbdiff-web", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/nbdime/webapp/nbdiffweb.py", line 96, in main
    return main_diff(opts)
           ^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/nbdime/webapp/nbdiffweb.py", line 82, in main_diff
    return handle_gitrefs(base, remote, path, opts)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/nbdime/webapp/nbdiffweb.py", line 64, in handle_gitrefs
    status = run_server(
             ^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/site-packages/nbdime/webapp/nbdimeserver.py", line 446, in main_server
    io_loop.start()
  File "/private/tmp/.venv/lib/python3.12/site-packages/tornado/platform/asyncio.py", line 205, in start
    self.asyncio_loop.run_forever()
  File "/private/tmp/.venv/lib/python3.12/asyncio/base_events.py", line 639, in run_forever
    self._run_once()
  File "/private/tmp/.venv/lib/python3.12/asyncio/base_events.py", line 1947, in _run_once
    event_list = self._selector.select(timeout)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/tmp/.venv/lib/python3.12/selectors.py", line 566, in select
    kev_list = self._selector.control(None, max_ev, timeout)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
KeyboardInterrupt

This is on macOS 14.3.1

[yan12125]

Seems related to the latest jupyter-server. I can get it working with pip install 'jupyter-server==2.12.5'.

[edmundhenley-mo]

Just encountered the same issue on Linux, updating an old conda env using nbdime==3.1.1 (which didn't exhibit this) to nbdime==4.0.1 (context: old nbdiff-web was stalling on a big notebook; I wanted to try a newer version post #400 to see if any better).

Had no luck trying to roll back nbdime version alone (when I tried, striding releases, confirmed issue present in nbdime versions [4.0.0, 3.2.1, <gave up>])

Gave up as I spotted jupyter-server/jupyter_server#1392 enabling authentication by default: pinning only jupyter_server to v2.12.5 (version just before that auth PR went in) seems to give a workaround for now (ha, you've just pipped me to post @yan12125!)

Info for reproducing @ nbdime==4.0.1 (incl. lockfile)

How I created the conda env exhibiting login_url error:

$ conda --version
conda 24.1.0
$ conda create --name nbdime nbdime jupyter

(not shown: my ~/.condarc enforces conda-forge channel)

Lockfile for reproducing:

(nbdime) $ conda list --explicit --md5 > ~/nbdime_gh749_loginurl.lock
(nbdime) $ cat ~/nbdime_gh749_loginurl.lock 
# This file may be used to create an environment using:
# $ conda create --name <env> --file <this file>
# platform: linux-64
@EXPLICIT
https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2024.2.2-hbcca054_0.conda#2f4327a1cbe7f022401b236e915a5fef
https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.40-h41732ed_0.conda#7aca3059a1729aa76c597603f10b0dd3
https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-13.2.0-h7e041cc_5.conda#f6f6600d18a4047b54f803cf708b868a
https://conda.anaconda.org/conda-forge/linux-64/pandoc-3.1.12.2-ha770c72_0.conda#4f04ceee8d953367da7de726af233303
https://conda.anaconda.org/conda-forge/linux-64/python_abi-3.12-4_cp312.conda#dccc2d142812964fcc6abdc97b672dff
https://conda.anaconda.org/conda-forge/noarch/tzdata-2024a-h0c530f3_0.conda#161081fc7cec0bfda0d86d7cb595f8d8
https://conda.anaconda.org/conda-forge/linux-64/libgomp-13.2.0-h807b86a_5.conda#d211c42b9ce49aee3734fdc828731689
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https://conda.anaconda.org/conda-forge/linux-64/libexpat-2.6.1-h59595ed_0.conda#476fb82aba5358a08d52ec44e286ce33
https://conda.anaconda.org/conda-forge/linux-64/libffi-3.4.2-h7f98852_5.tar.bz2#d645c6d2ac96843a2bfaccd2d62b3ac3
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https://conda.anaconda.org/conda-forge/noarch/python-json-logger-2.0.7-pyhd8ed1ab_0.conda#a61bf9ec79426938ff785eb69dbb1960
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https://conda.anaconda.org/conda-forge/noarch/rfc3986-validator-0.1.1-pyh9f0ad1d_0.tar.bz2#912a71cc01012ee38e6b90ddd561e36f
https://conda.anaconda.org/conda-forge/linux-64/rpds-py-0.18.0-py312h4b3b743_0.conda#cc8165b34bdb002ade83b068f44e5774
https://conda.anaconda.org/conda-forge/noarch/send2trash-1.8.2-pyh41d4057_0.conda#ada5a17adcd10be4fc7e37e4166ba0e2
https://conda.anaconda.org/conda-forge/noarch/setuptools-69.1.1-pyhd8ed1ab_0.conda#576de899521b7d43674ba3ef6eae9142
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https://conda.anaconda.org/conda-forge/noarch/smmap-5.0.0-pyhd8ed1ab_0.tar.bz2#62f26a3d1387acee31322208f0cfa3e0
https://conda.anaconda.org/conda-forge/noarch/sniffio-1.3.1-pyhd8ed1ab_0.conda#490730480d76cf9c8f8f2849719c6e2b
https://conda.anaconda.org/conda-forge/noarch/soupsieve-2.5-pyhd8ed1ab_1.conda#3f144b2c34f8cb5a9abd9ed23a39c561
https://conda.anaconda.org/conda-forge/noarch/tomli-2.0.1-pyhd8ed1ab_0.tar.bz2#5844808ffab9ebdb694585b50ba02a96
https://conda.anaconda.org/conda-forge/linux-64/tornado-6.4-py312h98912ed_0.conda#e8332e534dca8c5c12c8352e0a23501c
https://conda.anaconda.org/conda-forge/noarch/traitlets-5.14.1-pyhd8ed1ab_0.conda#1c6acfdc7ecbfe09954c4216da99c146
https://conda.anaconda.org/conda-forge/noarch/types-python-dateutil-2.8.19.20240311-pyhd8ed1ab_0.conda#bd1f4958ce0d78874e98f6b28e3da15e
https://conda.anaconda.org/conda-forge/noarch/typing_extensions-4.10.0-pyha770c72_0.conda#16ae769069b380646c47142d719ef466
https://conda.anaconda.org/conda-forge/noarch/typing_utils-0.1.0-pyhd8ed1ab_0.tar.bz2#eb67e3cace64c66233e2d35949e20f92
https://conda.anaconda.org/conda-forge/noarch/uri-template-1.3.0-pyhd8ed1ab_0.conda#0944dc65cb4a9b5b68522c3bb585d41c
https://conda.anaconda.org/conda-forge/noarch/wcwidth-0.2.13-pyhd8ed1ab_0.conda#68f0738df502a14213624b288c60c9ad
https://conda.anaconda.org/conda-forge/noarch/webcolors-1.13-pyhd8ed1ab_0.conda#166212fe82dad8735550030488a01d03
https://conda.anaconda.org/conda-forge/noarch/webencodings-0.5.1-pyhd8ed1ab_2.conda#daf5160ff9cde3a468556965329085b9
https://conda.anaconda.org/conda-forge/noarch/websocket-client-1.7.0-pyhd8ed1ab_0.conda#50ad31e07d706aae88b14a4ac9c73f23
https://conda.anaconda.org/conda-forge/noarch/wheel-0.42.0-pyhd8ed1ab_0.conda#1cdea58981c5cbc17b51973bcaddcea7
https://conda.anaconda.org/conda-forge/noarch/widgetsnbextension-4.0.10-pyhd8ed1ab_0.conda#521f489e3babeddeec638c2add7e9e64
https://conda.anaconda.org/conda-forge/noarch/zipp-3.17.0-pyhd8ed1ab_0.conda#2e4d6bc0b14e10f895fc6791a7d9b26a
https://conda.anaconda.org/conda-forge/noarch/anyio-4.3.0-pyhd8ed1ab_0.conda#ac95aa8ed65adfdde51132595c79aade
https://conda.anaconda.org/conda-forge/noarch/asttokens-2.4.1-pyhd8ed1ab_0.conda#5f25798dcefd8252ce5f9dc494d5f571
https://conda.anaconda.org/conda-forge/noarch/async-lru-2.0.4-pyhd8ed1ab_0.conda#3d081de3a6ea9f894bbb585e8e3a4dcb
https://conda.anaconda.org/conda-forge/noarch/babel-2.14.0-pyhd8ed1ab_0.conda#9669586875baeced8fc30c0826c3270e
https://conda.anaconda.org/conda-forge/noarch/beautifulsoup4-4.12.3-pyha770c72_0.conda#332493000404d8411859539a5a630865
https://conda.anaconda.org/conda-forge/noarch/bleach-6.1.0-pyhd8ed1ab_0.conda#0ed9d7c0e9afa7c025807a9a8136ea3e
https://conda.anaconda.org/conda-forge/noarch/cached-property-1.5.2-hd8ed1ab_1.tar.bz2#9b347a7ec10940d3f7941ff6c460b551
https://conda.anaconda.org/conda-forge/linux-64/cffi-1.16.0-py312hf06ca03_0.conda#56b0ca764ce23cc54f3f7e2a7b970f6d
https://conda.anaconda.org/conda-forge/noarch/comm-0.2.1-pyhd8ed1ab_0.conda#f4385072f4909bc974f6675a36e76796
https://conda.anaconda.org/conda-forge/noarch/gitdb-4.0.11-pyhd8ed1ab_0.conda#623b19f616f2ca0c261441067e18ae40
https://conda.anaconda.org/conda-forge/noarch/h11-0.14.0-pyhd8ed1ab_0.tar.bz2#b21ed0883505ba1910994f1df031a428
https://conda.anaconda.org/conda-forge/noarch/h2-4.1.0-pyhd8ed1ab_0.tar.bz2#b748fbf7060927a6e82df7cb5ee8f097
https://conda.anaconda.org/conda-forge/noarch/importlib-metadata-7.0.2-pyha770c72_0.conda#b050a4bb0e90ebd6e7fa4093d6346867
https://conda.anaconda.org/conda-forge/noarch/importlib_resources-6.1.3-pyhd8ed1ab_0.conda#b865eadcceebf641fa833ee086756e8b
https://conda.anaconda.org/conda-forge/noarch/jedi-0.19.1-pyhd8ed1ab_0.conda#81a3be0b2023e1ea8555781f0ad904a2
https://conda.anaconda.org/conda-forge/noarch/jinja2-3.1.3-pyhd8ed1ab_0.conda#e7d8df6509ba635247ff9aea31134262
https://conda.anaconda.org/conda-forge/linux-64/jupyter_core-5.7.1-py312h7900ff3_0.conda#a26a2c80b748744dafb642a9a729e119
https://conda.anaconda.org/conda-forge/noarch/jupyterlab_pygments-0.3.0-pyhd8ed1ab_1.conda#afcd1b53bcac8844540358e33f33d28f
https://conda.anaconda.org/conda-forge/noarch/matplotlib-inline-0.1.6-pyhd8ed1ab_0.tar.bz2#b21613793fcc81d944c76c9f2864a7de
https://conda.anaconda.org/conda-forge/noarch/overrides-7.7.0-pyhd8ed1ab_0.conda#24fba5a9d161ad8103d4e84c0e1a3ed4
https://conda.anaconda.org/conda-forge/noarch/pexpect-4.9.0-pyhd8ed1ab_0.conda#629f3203c99b32e0988910c93e77f3b6
https://conda.anaconda.org/conda-forge/noarch/pip-24.0-pyhd8ed1ab_0.conda#f586ac1e56c8638b64f9c8122a7b8a67
https://conda.anaconda.org/conda-forge/noarch/prompt-toolkit-3.0.42-pyha770c72_0.conda#0bf64bf10eee21f46ac83c161917fa86
https://conda.anaconda.org/conda-forge/noarch/python-dateutil-2.9.0-pyhd8ed1ab_0.conda#2cf4264fffb9e6eff6031c5b6884d61c
https://conda.anaconda.org/conda-forge/noarch/qtpy-2.4.1-pyhd8ed1ab_0.conda#7f391bd70d2abfb70f304ba5aa4e1261
https://conda.anaconda.org/conda-forge/noarch/referencing-0.33.0-pyhd8ed1ab_0.conda#bc415a1c6cf049166215d6b596e0fcbe
https://conda.anaconda.org/conda-forge/noarch/rfc3339-validator-0.1.4-pyhd8ed1ab_0.tar.bz2#fed45fc5ea0813240707998abe49f520
https://conda.anaconda.org/conda-forge/noarch/terminado-0.18.0-pyh0d859eb_0.conda#e463f348b8b0eb62c9f7c6fbc780286c
https://conda.anaconda.org/conda-forge/noarch/tinycss2-1.2.1-pyhd8ed1ab_0.tar.bz2#7234c9eefff659501cd2fe0d2ede4d48
https://conda.anaconda.org/conda-forge/noarch/typing-extensions-4.10.0-hd8ed1ab_0.conda#091683b9150d2ebaa62fd7e2c86433da
https://conda.anaconda.org/conda-forge/noarch/urllib3-2.2.1-pyhd8ed1ab_0.conda#08807a87fa7af10754d46f63b368e016
https://conda.anaconda.org/conda-forge/linux-64/argon2-cffi-bindings-21.2.0-py312h98912ed_4.conda#00536e0a1734dcde9815fe227f32fc5a
https://conda.anaconda.org/conda-forge/noarch/arrow-1.3.0-pyhd8ed1ab_0.conda#b77d8c2313158e6e461ca0efb1c2c508
https://conda.anaconda.org/conda-forge/noarch/fqdn-1.5.1-pyhd8ed1ab_0.tar.bz2#642d35437078749ef23a5dca2c9bb1f3
https://conda.anaconda.org/conda-forge/noarch/gitpython-3.1.42-pyhd8ed1ab_0.conda#6bc8e496351bafd761c0922c3ebd989a
https://conda.anaconda.org/conda-forge/noarch/httpcore-1.0.4-pyhd8ed1ab_0.conda#20f047662cf4fa8b97836111df87dbb4
https://conda.anaconda.org/conda-forge/noarch/importlib_metadata-7.0.2-hd8ed1ab_0.conda#d11132727a247f2c1998779a2af743a1
https://conda.anaconda.org/conda-forge/noarch/jsonschema-specifications-2023.12.1-pyhd8ed1ab_0.conda#a0e4efb5f35786a05af4809a2fb1f855
https://conda.anaconda.org/conda-forge/noarch/jupyter_server_terminals-0.5.2-pyhd8ed1ab_0.conda#a0152d13c9deb13639fc84df884d50b6
https://conda.anaconda.org/conda-forge/noarch/prompt_toolkit-3.0.42-hd8ed1ab_0.conda#85a2189ecd2fcdd86e92b2d4ea8fe461
https://conda.anaconda.org/conda-forge/noarch/requests-2.31.0-pyhd8ed1ab_0.conda#a30144e4156cdbb236f99ebb49828f8b
https://conda.anaconda.org/conda-forge/noarch/stack_data-0.6.2-pyhd8ed1ab_0.conda#e7df0fdd404616638df5ece6e69ba7af
https://conda.anaconda.org/conda-forge/noarch/argon2-cffi-23.1.0-pyhd8ed1ab_0.conda#3afef1f55a1366b4d3b6a0d92e2235e4
https://conda.anaconda.org/conda-forge/noarch/httpx-0.27.0-pyhd8ed1ab_0.conda#9f359af5a886fd6ca6b2b6ea02e58332
https://conda.anaconda.org/conda-forge/noarch/ipython-8.22.2-pyh707e725_0.conda#f0abe827c8a7c6d91bccdf90cb1fbee3
https://conda.anaconda.org/conda-forge/noarch/isoduration-20.11.0-pyhd8ed1ab_0.tar.bz2#4cb68948e0b8429534380243d063a27a
https://conda.anaconda.org/conda-forge/noarch/jsonschema-4.21.1-pyhd8ed1ab_0.conda#8a3a3d01629da20befa340919e3dd2c4
https://conda.anaconda.org/conda-forge/noarch/jupyter_client-8.6.0-pyhd8ed1ab_0.conda#6bd3f1069cdebb44c7ae9efb900e312d
https://conda.anaconda.org/conda-forge/noarch/ipykernel-6.29.3-pyhd33586a_0.conda#e0deff12c601ce5cb7476f93718f3168
https://conda.anaconda.org/conda-forge/noarch/ipywidgets-8.1.2-pyhd8ed1ab_0.conda#67f86478c78637f68c1f3858973021f2
https://conda.anaconda.org/conda-forge/noarch/jsonschema-with-format-nongpl-4.21.1-pyhd8ed1ab_0.conda#26bce4b5405738c09304d4f4796b2c2a
https://conda.anaconda.org/conda-forge/noarch/nbformat-5.9.2-pyhd8ed1ab_0.conda#61ba076de6530d9301a0053b02f093d2
https://conda.anaconda.org/conda-forge/noarch/jupyter_console-6.6.3-pyhd8ed1ab_0.conda#7cf6f52a66f8e3cd9d8b6c231262dcab
https://conda.anaconda.org/conda-forge/noarch/jupyter_events-0.9.0-pyhd8ed1ab_0.conda#00ba25993f0dba38cf72a7224e33289f
https://conda.anaconda.org/conda-forge/noarch/nbclient-0.8.0-pyhd8ed1ab_0.conda#e78da91cf428faaf05701ce8cc8f2f9b
https://conda.anaconda.org/conda-forge/noarch/qtconsole-base-5.5.1-pyha770c72_0.conda#5528a3eda283b421055c89bface19a1c
https://conda.anaconda.org/conda-forge/noarch/nbconvert-core-7.16.2-pyhd8ed1ab_0.conda#5ab3248dd05c543dc631276455ef6a54
https://conda.anaconda.org/conda-forge/noarch/jupyter_server-2.13.0-pyhd8ed1ab_0.conda#e242df505f194c4932fbb840a99207e2
https://conda.anaconda.org/conda-forge/noarch/nbconvert-pandoc-7.16.2-pyhd8ed1ab_0.conda#7a0bfebd69213722427cb61b077b4187
https://conda.anaconda.org/conda-forge/noarch/jupyter-lsp-2.2.4-pyhd8ed1ab_0.conda#91f93e1ebf6535be518715432d89fd92
https://conda.anaconda.org/conda-forge/noarch/jupyter-server-mathjax-0.2.6-pyh5bfe37b_1.conda#11ca195fc8a16770661a387bcce27c36
https://conda.anaconda.org/conda-forge/noarch/jupyterlab_server-2.25.4-pyhd8ed1ab_0.conda#ffd61670ae09d2d3c637f6afd29db443
https://conda.anaconda.org/conda-forge/noarch/nbconvert-7.16.2-pyhd8ed1ab_0.conda#e14e35cc4a5c90694bb41c5317b576a8
https://conda.anaconda.org/conda-forge/noarch/notebook-shim-0.2.4-pyhd8ed1ab_0.conda#3d85618e2c97ab896b5b5e298d32b5b3
https://conda.anaconda.org/conda-forge/noarch/jupyterlab-4.1.4-pyhd8ed1ab_0.conda#5af1ffec7c245d1ab2bf0cec0148a4c3
https://conda.anaconda.org/conda-forge/noarch/nbdime-4.0.1-pyhd8ed1ab_0.conda#dd76d44a144499f8ff3254fd20cdb7a2
https://conda.anaconda.org/conda-forge/noarch/notebook-7.1.1-pyhd8ed1ab_0.conda#f1a93f00b030dbede427001862c2854b
https://conda.anaconda.org/conda-forge/noarch/jupyter-1.0.0-pyhd8ed1ab_10.conda#056b8cc3d9b03f54fc49e6d70d7dc359

Info for workaround @ jupyter_server==2.12.5 (incl. lockfile)

Creating workaround env:

$ conda create --name nbdime nbdime jupyter jupyter_server==2.12.5

Lockfile for workaround env:

(nbdime) $ conda list --explicit --md5 > ~/nbdime_gh749_loginurl_jupyterserver_v2p12p5.lock
(nbdime) $ cat ~/nbdime_gh749_loginurl_jupyterserver_v2p12p5.lock 
# This file may be used to create an environment using:
# $ conda create --name <env> --file <this file>
# platform: linux-64
@EXPLICIT
https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2024.2.2-hbcca054_0.conda#2f4327a1cbe7f022401b236e915a5fef
https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.40-h41732ed_0.conda#7aca3059a1729aa76c597603f10b0dd3
https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-13.2.0-h7e041cc_5.conda#f6f6600d18a4047b54f803cf708b868a
https://conda.anaconda.org/conda-forge/linux-64/pandoc-3.1.12.2-ha770c72_0.conda#4f04ceee8d953367da7de726af233303
https://conda.anaconda.org/conda-forge/linux-64/python_abi-3.12-4_cp312.conda#dccc2d142812964fcc6abdc97b672dff
https://conda.anaconda.org/conda-forge/noarch/tzdata-2024a-h0c530f3_0.conda#161081fc7cec0bfda0d86d7cb595f8d8
https://conda.anaconda.org/conda-forge/linux-64/libgomp-13.2.0-h807b86a_5.conda#d211c42b9ce49aee3734fdc828731689
https://conda.anaconda.org/conda-forge/linux-64/_openmp_mutex-4.5-2_gnu.tar.bz2#73aaf86a425cc6e73fcf236a5a46396d
https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-13.2.0-h807b86a_5.conda#d4ff227c46917d3b4565302a2bbb276b
https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-hd590300_5.conda#69b8b6202a07720f448be700e300ccf4
https://conda.anaconda.org/conda-forge/linux-64/libexpat-2.6.1-h59595ed_0.conda#476fb82aba5358a08d52ec44e286ce33
https://conda.anaconda.org/conda-forge/linux-64/libffi-3.4.2-h7f98852_5.tar.bz2#d645c6d2ac96843a2bfaccd2d62b3ac3
https://conda.anaconda.org/conda-forge/linux-64/libnsl-2.0.1-hd590300_0.conda#30fd6e37fe21f86f4bd26d6ee73eeec7
https://conda.anaconda.org/conda-forge/linux-64/libsodium-1.0.18-h36c2ea0_1.tar.bz2#c3788462a6fbddafdb413a9f9053e58d
https://conda.anaconda.org/conda-forge/linux-64/libuuid-2.38.1-h0b41bf4_0.conda#40b61aab5c7ba9ff276c41cfffe6b80b
https://conda.anaconda.org/conda-forge/linux-64/libxcrypt-4.4.36-hd590300_1.conda#5aa797f8787fe7a17d1b0821485b5adc
https://conda.anaconda.org/conda-forge/linux-64/libzlib-1.2.13-hd590300_5.conda#f36c115f1ee199da648e0597ec2047ad
https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.4-h59595ed_2.conda#7dbaa197d7ba6032caf7ae7f32c1efa0
https://conda.anaconda.org/conda-forge/linux-64/openssl-3.2.1-hd590300_0.conda#51a753e64a3027bd7e23a189b1f6e91e
https://conda.anaconda.org/conda-forge/linux-64/xz-5.2.6-h166bdaf_0.tar.bz2#2161070d867d1b1204ea749c8eec4ef0
https://conda.anaconda.org/conda-forge/linux-64/yaml-0.2.5-h7f98852_2.tar.bz2#4cb3ad778ec2d5a7acbdf254eb1c42ae
https://conda.anaconda.org/conda-forge/linux-64/libsqlite-3.45.1-h2797004_0.conda#fc4ccadfbf6d4784de88c41704792562
https://conda.anaconda.org/conda-forge/linux-64/readline-8.2-h8228510_1.conda#47d31b792659ce70f470b5c82fdfb7a4
https://conda.anaconda.org/conda-forge/linux-64/tk-8.6.13-noxft_h4845f30_101.conda#d453b98d9c83e71da0741bb0ff4d76bc
https://conda.anaconda.org/conda-forge/linux-64/zeromq-4.3.5-h59595ed_1.conda#7fc9d3288d2420bb3637647621018000
https://conda.anaconda.org/conda-forge/linux-64/python-3.12.2-hab00c5b_0_cpython.conda#ad7b68400f3a6ebe72b00be093c7f301
https://conda.anaconda.org/conda-forge/noarch/attrs-23.2.0-pyh71513ae_0.conda#5e4c0743c70186509d1412e03c2d8dfa
https://conda.anaconda.org/conda-forge/linux-64/brotli-python-1.1.0-py312h30efb56_1.conda#45801a89533d3336a365284d93298e36
https://conda.anaconda.org/conda-forge/noarch/cached_property-1.5.2-pyha770c72_1.tar.bz2#576d629e47797577ab0f1b351297ef4a
https://conda.anaconda.org/conda-forge/noarch/certifi-2024.2.2-pyhd8ed1ab_0.conda#0876280e409658fc6f9e75d035960333
https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.3.2-pyhd8ed1ab_0.conda#7f4a9e3fcff3f6356ae99244a014da6a
https://conda.anaconda.org/conda-forge/noarch/colorama-0.4.6-pyhd8ed1ab_0.tar.bz2#3faab06a954c2a04039983f2c4a50d99
https://conda.anaconda.org/conda-forge/linux-64/debugpy-1.8.1-py312h30efb56_0.conda#bdd639417094ace2fb1ce10b20d68d5d
https://conda.anaconda.org/conda-forge/noarch/decorator-5.1.1-pyhd8ed1ab_0.tar.bz2#43afe5ab04e35e17ba28649471dd7364
https://conda.anaconda.org/conda-forge/noarch/defusedxml-0.7.1-pyhd8ed1ab_0.tar.bz2#961b3a227b437d82ad7054484cfa71b2
https://conda.anaconda.org/conda-forge/noarch/entrypoints-0.4-pyhd8ed1ab_0.tar.bz2#3cf04868fee0a029769bd41f4b2fbf2d
https://conda.anaconda.org/conda-forge/noarch/exceptiongroup-1.2.0-pyhd8ed1ab_2.conda#8d652ea2ee8eaee02ed8dc820bc794aa
https://conda.anaconda.org/conda-forge/noarch/executing-2.0.1-pyhd8ed1ab_0.conda#e16be50e378d8a4533b989035b196ab8
https://conda.anaconda.org/conda-forge/noarch/hpack-4.0.0-pyh9f0ad1d_0.tar.bz2#914d6646c4dbb1fd3ff539830a12fd71
https://conda.anaconda.org/conda-forge/noarch/hyperframe-6.0.1-pyhd8ed1ab_0.tar.bz2#9f765cbfab6870c8435b9eefecd7a1f4
https://conda.anaconda.org/conda-forge/noarch/idna-3.6-pyhd8ed1ab_0.conda#1a76f09108576397c41c0b0c5bd84134
https://conda.anaconda.org/conda-forge/noarch/json5-0.9.22-pyhd8ed1ab_0.conda#2fa51897d3aee2fe1636b98d9a6236dc
https://conda.anaconda.org/conda-forge/linux-64/jsonpointer-2.4-py312h7900ff3_3.conda#50f62bdb9b60b13c2f6ae69957342e4d
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[guilherme-francisco]

Seems related to the latest jupyter-server. I can get it working with pip install 'jupyter-server==2.12.5'.

It fixed my problem. Thanks!

[krassowski]

It looks like login_url setting is not getting passed for auth handlers in nbdime. For reference the jupyter-server passes:

"login_url": url_path_join(base_url, "/login"),

I think it should be added somewhere here:

nbdime/nbdime/webapp/nbdimeserver.py

Lines 382 to 397 in 9a02e0d

	settings = {
	'log_function': log_request,
	'static_path': static_path,
	'static_url_prefix': prefix + '/static/',
	'template_path': [template_path],
	'base_url': base_url,
	'jinja2_env': env,
	'local_hostnames': ['localhost', '127.0.0.1'],
	'cookie_secret': base64.encodebytes(os.urandom(32)), # Needed even for an unsecured server.
	}
	try:
	from jupyter_server.auth import IdentityProvider
	settings['identity_provider'] = IdentityProvider()
	except ImportError:
	pass

[yan12125]

Is login necessary for nbdime? I can get it working by adding 'allow_unauthenticated_access': True to the aforementioned settings dictionary:

diff --git a/nbdime/webapp/nbdimeserver.py b/nbdime/webapp/nbdimeserver.py
index e4d98b6..4c35c7f 100644
--- a/nbdime/webapp/nbdimeserver.py
+++ b/nbdime/webapp/nbdimeserver.py
@@ -388,6 +388,7 @@ def make_app(**params):
         'jinja2_env': env,
         'local_hostnames': ['localhost', '127.0.0.1'],
         'cookie_secret': base64.encodebytes(os.urandom(32)), # Needed even for an unsecured server.
+        'allow_unauthenticated_access': True,
     }
 
     try:

I also added this patch to the Arch Linux package, so that users can at least get back a working command.

[stefanzero]

Thanks yan12125 . I cloned the repo, and your patch worked!

When will this be fixed in the version of nbdime (4.0.1) installed by Brew on OSX (Monterey)?

[krassowski]

Login is not necessary but authentication is necessary. Setting allow_unauthenticated_access to True will prevent jupyter-server from detecting insecure endpoints. This can lead to security vulnerabilities, so the suggestion from #749 (comment) should not be merged into the code base.

[etep]

I hit this issue, and currently I have jupyter_server==2.14.1. The comment trail above indicates the issue is closed, but it's not clear what the fix is. My takeaway... to fix, one must either:

1. roll back jupyter server to an older version, or
2. clone & patch the nbdime repo to be insecure (but how insecure is this... I'm running all this on my machine).