The jqXHR object used by jQuery.ajax has a property statusText, which can have two values when aborting the XHR: canceled and abort. When is the former used and when is the latter?
Here is the relevant source code of ajax.js:
// Default abort message
strAbort = "canceled",
// Fake xhr
jqXHR = {
...
// Cancel the request
abort: function( statusText ) {
var finalText = statusText || strAbort;
if ( transport ) {
transport.abort( finalText );
}
done( 0, finalText );
return this;
}
};
...
// Apply prefilters
inspectPrefiltersOrTransports( prefilters, s, options, jqXHR );
// If request was aborted inside a prefilter, stop there
if ( state === 2 ) {
return jqXHR;
}
...
// aborting is no longer a cancellation
strAbort = "abort";
It reads that if you abort the XHR request in the prefilter, then the statusText is canceled, otherwise it is abort.