Following code may work incorrect for default (80) http port:

var parts = rurl.exec( s.url ),

remote = parts && (parts[1] && parts[1] !== location.protocol || parts[2] !== location.host);

For example IE9 (Preview 4) returns default port in window.location.host (for example - 'localhost:80'). Even more - if we send XHR to 'http://some-host:80/some-path', then jQuery will detect it as remote query (which is wrong).

We need to check for both hosts (parts[2] and location.host) that them contains (or not) port. If not - add default 80.