Atmosphere/atmosphere — comment on commit f464197ff0d76d54d9418716091fbb7ae5a1d2fb
File: modules/jquery/src/main/webapp/jquery/jquery.atmosphere.js line 150
By flowersinthesand:

This error handler will never be called because there is no way to catch an error when using jsonp. You can check this feature at http://api.jquery.com/jQuery.ajax/