handling err connection refused

[rrphotosoft]

Hi,
I have been using your gem successfully, but for one problem.
I'm simulating a situation where the server is down, or the connection is refused for some reason.
In that case, my console output is as follows:

POST
http://localhost:3000/units net::ERR_CONNECTION_REFUSED

jquery.iframe-transport.self-9d6de1e….js?bo…:190 Uncaught SecurityError: Blocked a frame with origin "http://localhost:3000" from accessing a frame with origin "null". The frame requesting access has a protocol of "http", the frame being accessed has a protocol of "data". Protocols must match

Any idea how I can catch this error, so that I can show the user a simple message saying the server is down? I tried wrapping my form.submit() js call in a try{}catch{} block, but it does not work.

Best Regards,
RR.