It's definitely a client-side issue, however before your upgrade your Apache configuration would just accept those broken requests without error. In particular, IE6/7 are knows for broken HTTP/1.1 handling.
I wonder what changes you applied to your Apache configuration. In particular, did you use to have "BrowserMatch" directives that you didn't carry through your upgrade ? ** Changed in: apache2 (Ubuntu) Importance: Undecided => Medium ** Changed in: apache2 (Ubuntu) Status: New => Incomplete -- client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23) https://bugs.launchpad.net/bugs/589611 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs