It seems the problem is reusing the same connection for different subdomains. I could very easily reproduce this with "gnutls-cli launchpad.net" and then requesting a different subdomain.
** Changed in: launchpad Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/823325 Title: 400 Bad Request on Launchpad subdomains To manage notifications about this bug go to: https://bugs.launchpad.net/launchpad/+bug/823325/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs