I had a similar problem with unusual status codes in Safari which caused lots of confusion. If you give it a 204 (example: http://httpbin.org/status/204 http://

I had a similar problem with unusual status codes in Safari which caused lots of confusion. If you give it a 204 (example: http://httpbin.org/status/204 http://httpbin.org/status/204), weird things happen - it doesn't even change the currently displayed page to a blank one, the URL bar behavior is undefined (the URL bar doesn't change unless the developer tools are open) and the request doesn't appear in the developer tools either.