jqXHR.statusText 'abort' vs 'canceled' when aborting the XHR

Question

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?

Answer 1

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.