Etherpad Popout Button not working

[kettenfett]

Description

Etherpad Popout Button not working. Getting "403 Forbidden"

Steps to reproduce

• Add the Etherpad Widget to a room
• Give the room a custom name (not sure if relevant)
• using hyphens as bullet points
• click popout button

Describe how what happens differs from what you expected.

• browser opens with 403 forbidden error

Logs being sent: no

Version information

• Platform: desktop app
• Version: Element version: 1.7.3, olm version: 3.1.3
• OS: win x64
• Browser (after clicking popout button): Firefox, also tested the given URL in chromium. Same error

The popout Button tries to open a URL like this:

https://scalar.vector.im/api/widgets/etherpad.html?padName=!HltKLmaRClmCrnRPXt:matrix.org_mypad&userName=%40some_username%3Amatrix.org

(pad ID and user ID changed)

But I think, it should send this URL to the Browser instead:

https://scalar.vector.im/etherpad/p/!HltKLmaRClmCrnRPXt:matrix.org_mypad?userName=%40some_username%3Amatrix.org

Because that actually works.

[colans]

I can reproduce this.

Not working:

• https://scalar.vector.im/api/widgets/etherpad.html?padName=!tdfkWnNLprRlgIspUx:matrix.org_Test_etherpad&userName=%40username%3Amatrix.org

Working:

• https://scalar.vector.im/etherpad/p/!tdfkWnNLprRlgIspUx_matrix.org_Test_etherpad

The URL provided on the Edit screen works for me, and that doesn't include a username.