CORS Error when using ?blueprint-url reference to github.com

[bph]

Although using GitHub.com URLs for file references inside blueprints works, well, when trying to reference the github.com URL in a queryparam of playground throws and CORS error

Example:

❌ Does not work: https://playground.wordpress.net/?blueprint-url=https://github.com/wptrainingteam/hellodashboard/blob/main/blueprint.json

✅ Works: https://playground.wordpress.net/?blueprint-url=https://raw.githubusercontent.com/wptrainingteam/hellodashboard/main/blueprint.json