Expression-based asset URLs are not rewritten in Docker/self-hosted exports

[lucasbergstrand]

When using the normal asset picker in Webstudio, exported Docker/self-hosted builds correctly rewrite asset URLs from: /cgi/image/ to optimized self-hosted paths such as: /_image/w_3840,q_80/assets/

However, when an asset is referenced through the expression editor using: assets.data["assetID"].url, the exported build still outputs the original /cgi/* URL. This results in a path that does not exist.

Reproduction Steps:

1. Upload an asset such as an audio file
2. Use the expression editor and reference the asset with:
   assets.data["assetID"].url as the source. In this example we'll use an
3. Export the project as Docker/self-hosted
4. Run the exported app
5. Observe broken asset URLs

Here's a cloneable project already setup: https://p-2e368a08-eb25-4773-839e-137e37938dc2.apps.webstudio.is/?authToken=f9e8fb0f-1a74-4612-b51a-d746c8706b5a&mode=preview

[kof]

Want to contribute a fix?

[lucasbergstrand]

I would love to, but unfortunately I lack the programming skills to contribute to a fix.. I Just wanted to report the issue!

[kof]

People these days contribute using agents. GPT 5.5 is my recommendation. Important is that you can verify your fix.