General usage
GitHub avatar URLs use a numeric user ID after /u/. Preserve that ID and replace avatars.githubusercontent.com with avatars-githubusercontent-webp.webp.se.
Original
https://avatars.githubusercontent.com/u/:id↓Public servicehttps://avatars-githubusercontent-webp.webp.se/u/:idExample
For GitHub user ID 24852034, the public-service URL is:
https://avatars-githubusercontent-webp.webp.se/u/24852034
The numeric user ID is stable for this URL pattern. A GitHub username is not interchangeable with the :id value.