What does status=canceled for a resource mean in Chrome Developer Tools?

Question

What would cause a page to be canceled? I have a screenshot of the Chrome Developer Tools.

Answer 1

status=canceled may happen also on ajax requests on JavaScript events:

call 

The event successfully sends the request, but is is canceled then (but processed by the server). The reason is, the elements submit forms on click events, no matter if you make any ajax requests on the same click event.

To prevent request from being cancelled, JavaScript event.preventDefault(); have to be called: