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code-server: Not allowed to display insecure content from http://localhost:2718/ · Issue #27 · marimo-team/vscode-marimo · GitHub

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This repository was archived by the owner on Oct 12, 2026. It is now read-only.

code-server: Not allowed to display insecure content from http://localhost:2718/ #27

Closed as not planned
Closed as not planned
code-server: Not allowed to display insecure content from http://localhost:2718/#27

Description

benz0li
opened on Jun 22, 2024

Description

Does not work on a non-localhost deployment of code-server, e.g. at https://demo.jupyter.b-data.ch.
ℹ️ This deployment uses Træfik as [front-]proxy1 and for TLS termination.

Reproduce

intro.py.txt

  1. Open https://demo.jupyter.b-data.ch
  2. Sign in with your GitHub account
  3. Select an image and start
  4. Open a Terminal
    • pip install marimo click
  5. Open code-sever
  6. Install the marino extension from VSIX
  7. Upload file intro.py.txt and rename to intro.py
  8. Open file intro.py and start marimo server (edit or run)

Expected behavior

Output can be displayed both in internal and external browser.

Context

https://demo.jupyter.b-data.ch

Browser Output 
[Warning] [blocked] The page at https://jupyter.b-data.ch/user/benz0li/test-for-jyio/code-server/stable-0c802ba1652296c79d26ff3e990578e67e6734b1/static/out/vs/workbench/contrib/webview/browser/pre/index.html?id=ab415c6a-f29a-48bf-85d8-8ef42f86a5ac&origin=10019dc9-ce7d-48be-b202-f15aba8dab21&swVersion=4&extensionId=marimo-team.vscode-marimo&platform=browser&vscode-resource-base-authority=vscode-resource.vscode-cdn.net&parentOrigin=https%3A%2F%2Fjupyter.b-data.ch&remoteAuthority=jupyter.b-data.ch was not allowed to display insecure content from http://localhost:2718/.

Footnotes

  1. Other proxies in place: JupyterHub: proxy no. 2; JupyterLab: Jupyter Server Proxy (proxy no. 3); code-server: web app (proxy no. 4) ↩

Activity

  1. benz0li commented on Jun 22, 2024

    benz0li
    on Jun 22, 2024
    Author

    ShinyApps work just fine in the same context. It also works fine with the Shiny extension – both using the internal1 and external browser.

    ℹ️ https://shiny.posit.co/r/getstarted/build-an-app/hello-shiny/getting-started.html

    Footnotes

    1. Simple Browser ↩

  2. benz0li commented on Jun 26, 2024

    benz0li
    on Jun 26, 2024
    Author

    @mscolnick It would be great to have this extension working properly with JupyterLab + code-server. I also advocated for this with other extensions:

    R extension

    Quarto extension

    LaTeX Workshop extension

  3. mscolnick commented on Jun 26, 2024

    mscolnick
    on Jun 26, 2024
    Contributor

    @benz0li - can you try the pre-release version (>0.3.3)? you can set https, host, and port? Is that enough to bypass this issue?

  4. benz0li commented on Jun 26, 2024

    benz0li
    on Jun 26, 2024
    Author

    @benz0li - can you try the pre-release version (>0.3.3)? you can set https, host, and port? Is that enough to bypass this issue?

    You may test yourself at https://demo.jupyter.b-data.ch. Login with your GitHub account.
    ℹ️ If the server (container) does not start, just try again.

  5. benz0li commented on Jun 26, 2024

    benz0li
    on Jun 26, 2024
    Author

    @mscolnick Not that I am unwilling to test myself... but you get the results faster this way.

    And you can check the Browser Console while testing.

    P.S.: I consider https://demo.jupyter.b-data.ch a reference deployment where issues [like this one] can be reproduced by any user at any time – independently.

  6. benz0li commented on Jun 26, 2024

    benz0li
    on Jun 26, 2024
    Author

    P.P.S.: @mscolnick There was the same error with the LaTeX Workshop extension. For more information, see James-Yu/LaTeX-Workshop@e4e48b1#commitcomment-138712360 ff plus

  7. benz0li commented on Jun 26, 2024

    benz0li
    on Jun 26, 2024
    Author

    It does not work on GitHub Codespaces with the internal browser either.

    Tested using b-data's/my Data Science dev containers, Python scipy image.

  8. mscolnick commented on Jun 26, 2024

    mscolnick
    on Jun 26, 2024
    Contributor

    Thanks @benz0li - i hopefully can test it out today (need to make the time)

  9. mscolnick commented on Jul 3, 2024

    mscolnick
    on Jul 3, 2024
    Contributor

    @benz0li im still unsure how to test in your environment - but hopefully this fixes it 6bf39d1. I will release shortly

  10. benz0li commented on Jul 14, 2024

    benz0li
    on Jul 14, 2024
    Author

    @benz0li im still unsure how to test in your environment

    Then, use b-data's/my Data Science dev containers, Python scipy image.

    but hopefully this fixes it 6bf39d1.

    Unfortunately, it does not.

    I will release shortly

    Tested with marimo extension v0.4.1.

  11. benz0li commented on Jul 18, 2024

    benz0li
    on Jul 18, 2024
    Author

    Does not work with the marimo extension v0.4.2 either.

  12. benz0li commented on Aug 16, 2024

    benz0li
    on Aug 16, 2024
    Author

    Still does not work with

    1. code-server
      • non-localhost deployment behind proxy
    2. GitHub Codespaces
      • which is – in its essence – the same as 1.

  13. legout commented on Sep 10, 2024

    legout
    on Sep 10, 2024

    Any updates here? Would be awesome to get this working in code-server.

  14. benz0li commented on Sep 10, 2024

    benz0li
    on Sep 10, 2024
    Author

    ℹ️ The marimo extension in the Open VSX Registry is not up to date...

  15. benz0li commented on Oct 22, 2025

    benz0li
    on Oct 22, 2025
    Author

    Still does not work with code-server or GitHub Codespaces.

    Browser Output 
    2025-10-22 06:45:09.802 [info] marimo extension is now active!
2025-10-22 06:45:09.802 [info] [server-manager]: Could not recover any state
2025-10-22 06:45:11.486 [info] Using interpreter: /usr/local/bin/python
2025-10-22 06:45:11.486 [info] Executing: /usr/local/bin/python ["-m","marimo","--version"]
2025-10-22 06:45:48.885 [info] Mapping to external url https://demo.jupyter.b-data.ch/user/benz0li/code-server/proxy/2828/ from http://localhost:2828/
2025-10-22 06:45:49.000 [info] Mapping to external url https://demo.jupyter.b-data.ch/user/benz0li/code-server/proxy/2829/ from http://localhost:2829/
2025-10-22 06:45:49.102 [info] Mapping to external url https://demo.jupyter.b-data.ch/user/benz0li/code-server/proxy/2830/ from http://localhost:2830/
2025-10-22 06:45:49.193 [info] Mapping to external url https://demo.jupyter.b-data.ch/user/benz0li/code-server/proxy/2831/ from http://localhost:2831/
2025-10-22 06:45:49.282 [info] Mapping to external url https://demo.jupyter.b-data.ch/user/benz0li/code-server/proxy/2832/ from http://localhost:2832/
2025-10-22 06:45:49.376 [info] Mapping to external url https://demo.jupyter.b-data.ch/user/benz0li/code-server/proxy/2833/ from http://localhost:2833/
2025-10-22 06:45:49.495 [info] Mapping to external url https://demo.jupyter.b-data.ch/user/benz0li/code-server/proxy/2834/ from http://localhost:2834/
2025-10-22 06:45:49.591 [info] Mapping to external url https://demo.jupyter.b-data.ch/user/benz0li/code-server/proxy/2835/ from http://localhost:2835/
2025-10-22 06:45:49.677 [info] Mapping to external url https://demo.jupyter.b-data.ch/user/benz0li/code-server/proxy/2836/ from http://localhost:2836/
2025-10-22 06:45:49.767 [info] Mapping to external url https://demo.jupyter.b-data.ch/user/benz0li/code-server/proxy/2837/ from http://localhost:2837/
2025-10-22 06:45:49.851 [info] Mapping to external url https://demo.jupyter.b-data.ch/user/benz0li/code-server/proxy/2838/ from http://localhost:2838/
2025-10-22 06:45:49.973 [info] Mapping to external url https://demo.jupyter.b-data.ch/user/benz0li/code-server/proxy/2839/ from http://localhost:2839/
2025-10-22 06:45:50.057 [info] Mapping to external url https://demo.jupyter.b-data.ch/user/benz0li/code-server/proxy/2840/ from http://localhost:2840/
...

  16. mscolnick commented on Nov 5, 2025

    mscolnick
    on Nov 5, 2025
    Contributor

    Hi, we've launched a new VSCode extension at https://github.com/marimo-team/marimo-lsp (readme). It may mean this issue is resolved or no longer applicable. If the issue still exists, please file the issue on over on the new Issues page.

  17. mscolnick
    closed this as not plannedon Nov 5, 2025
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