AJAX call not handling server error 500/501

[jnordstrom]

The apache web server may throw a server error 500/501 for a number of reasons. When this happens the client request should show the error to the user. Currently when forwarding a message the client just hangs with the message "Sending Message" I debugged this with (Firebug) and confirmed the server is throwing an error 501. I also tested by generating a server 500 error.

Please note in my case the error 500 is coming from a server that is closer to the client in the network stack then the Roundcube apache server, other examples are caching proxies, security proxies, web firewalls, etc.

[till]

I think Jquery allows us to do this very easily.