function(response, ioArgs){} response is of type Object, ioArgs is of type dojo.__IoCallbackArgs. This function will be called when the request fails due to a network or server error, the url is invalid, etc. It will also be called if the load or handle callback throws an exception, unless djConfig.debugAtAllCosts is true. This allows deployed applications to continue to run even when a logic error happens in the callback, while making it easier to troubleshoot while in debug mode.
function(response, ioArgs){} response is of type Object, ioArgs is of type dojo.__IoCallbackArgs. This function will be called at the end of every request, whether or not an error occurs.
function(response, ioArgs){} response is of type Object, ioArgs is of type dojo.__IoCallbackArgs. This function will be called on a successful HTTP response code.
Default is false. If true, then a "dojo.preventCache" parameter is sent in the request with a value that changes with each request (timestamp). Useful only with GET-type requests.