playframework/play — comment on commit bb11124ad9edb19073d99b6949f45da592eddf4e
File: framework/src/play/libs/OAuth2.java line 47
By ahmetalpbalkan:

You should check for a `?` in given `authorizationURL` since people may need to pass additional request parameters like `?scope=...` in Facebook authentication case. Therefore the code should not just append another `?` if already exists.