The requested URL returned error: 500

$ git clone https://username@bitbucket.org/username/repo.git\\
Cloning into 'repo'...
fatal: unable to access 'https://username@bitbucket.org/username/repo.git/': The requested URL returned error: 500

Since yesterday servers don't work. Other people have this issue too, i.e. in comments BCLOUD-7994 .