excalidraw preview not displayed in gitpod/openvscode-server (no exceptions logged in browser console nor in the container log)

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.67.0, 1.68.1, 1.69.2
• OS Version: docker on Linux/Darwin (running on the same machines as the browsers listed below, http://localhost:3000)
• Used Browsers:
  • Chromium 103.0.5060.134 (snap) running on Ubuntu 22.04 5.15.0-41-generic with KDE installed ( sudo apt install kde-full )
  • Chromium 103.0.5060.134 (Official Build) Arch Linux (64-bit) running on 5.18.12-3-MANJARO
  • Google Chrome 103.0.5060.134 running on Darwin Kernel Version 21.5.0
• Excalidraw Extension: 3.2.0

Steps to Reproduce:

1. Clone this repository: https://github.com/talsenteam/issue-gitpod-openvscode-server-excalidraw-preview-not-displayed
2. Run docker compose up --detach
3. Visit http://localhost:3000/?folder=/home/workspace in your browser (preferrably Chromium without Extensions)
4. Navigate to the extensions store and install the Excalidraw plugin pomdtr.excalidraw-editor
5. Open the readonly file test.excalidraw in the editor

More info & some screenshots can be found in the linked repository.

Expected Behavior

The excalidraw preview / editor should be usable when working on http://localhost:3000 without even a reverse proxy (that may cause issues due to some CORS, etc settings).

Workaround

As mentioned by @pomdtr : The Excalidraw extension can be installed via the vsix file ( https://marketplace.visualstudio.com/items?itemName=pomdtr.excalidraw-editor ), then it works.

Notes

Linked Issue: https://github.com/gitpod-io/openvscode-server/issues/393

What do we need to do in order to get the extension to be displayed in the browser? many thanks in advance !!

[pomdtr]

I think it’s ok, it will allow other users to find the workaround

[talsenteam]

Installing the extension from the vsix file might fix the error.

Thanks for the hint! Installing it via the vsix file ( https://marketplace.visualstudio.com/items?itemName=pomdtr.excalidraw-editor ) works!