Moved jQuery.ajax.prefilter and jQuery.ajax.transport to jQuery.ajaxPrefilter and jQuery.ajaxTransport so that proxying the ajax method doesn't turn into a nightmare. Thanks go to scott_gonzalez and DaveMethvin for pointing out the issue. Also made ajaxSetup return "this" to enable chainable definitions -- jQuery.ajaxSetup(...).ajaxPrefilter(...).ajaxTransport(...).

src/ajax.js

@@ -161,6 +161,7 @@ jQuery.extend({
 
 	ajaxSetup: function( settings ) {
 		jQuery.extend( true, jQuery.ajaxSettings, settings );
+		return this;
 	},
 
 	ajaxSettings: {
@@ -599,7 +600,7 @@ jQuery.extend({
 		}
 
 		// Get transport
-		transport = jQuery.ajax.prefilter( s , options ).transport( s );
+		transport = jQuery.ajaxPrefilter( s , options ).ajaxTransport( s );
 
 		// Watch for a new set of requests
 		if ( s.global && jQuery.active++ === 0 ) {
@@ -849,7 +850,7 @@ function ajax_selectOrExecute( structure , s ) {
 		}
 	}
 
-	return noSelect ? jQuery.ajax : selected;
+	return noSelect ? jQuery : selected;
 }
 
 // Add an element to one of the structures in ajaxSettings
@@ -908,13 +909,13 @@ function ajax_addElement( structure , args ) {
 		}
 	}
 
-	return jQuery.ajax;
+	return jQuery;
 }
 
 // Install prefilter & transport methods
-jQuery.each( [ "prefilter" , "transport" ] , function( _ , name ) {
-	_ = name + "s";
-	jQuery.ajax[ name ] = function() {
+jQuery.each( [ "Prefilter" , "Transport" ] , function( _ , name ) {
+	_ = name.toLowerCase() + "s";
+	jQuery[ "ajax" + name ] = function() {
 		return ajax_addElement( _ , arguments );
 	};
 } );

src/ajax/jsonp.js

@@ -10,12 +10,11 @@ jQuery.ajaxSetup({
 	jsonpCallback: function() {
 		return "jsonp" + jsc++;
 	}
-});
 
 // Normalize jsonp queries
 // 1) put callback parameter in url or data
 // 2) sneakily ensure transportDataType is always jsonp for jsonp requests
-jQuery.ajax.prefilter("json jsonp", function(s, originalSettings) {
+}).ajaxPrefilter("json jsonp", function(s, originalSettings) {
 
 	if ( s.dataTypes[ 0 ] === "jsonp" ||
 		originalSettings.jsonp ||
@@ -38,7 +37,7 @@ jQuery.ajax.prefilter("json jsonp", function(s, originalSettings) {
 	}
 
 // Bind transport to jsonp dataType
-}).transport("jsonp", function(s) {
+}).ajaxTransport("jsonp", function(s) {
 
 	// Put callback in place
 	var responseContainer,

src/ajax/script.js

@@ -14,10 +14,9 @@ jQuery.ajaxSetup({
 	converters: {
 		"text script": jQuery.globalEval
 	}
-});
 
 // Bind script tag hack transport
-jQuery.ajax.transport("script", function(s) {
+}).ajaxTransport("script", function(s) {
 
 	// Handle cache special case
 	if ( s.cache === undefined ) {

src/ajax/xhr.js

@@ -10,7 +10,7 @@ var // Next active xhr id
 	xhrUnloadAbortInstalled;
 
 
-jQuery.ajax.transport( function( s , determineDataType ) {
+jQuery.ajaxTransport( function( s , determineDataType ) {
 
 	// Cross domain only allowed if supported through XMLHttpRequest
 	if ( ! s.crossDomain || jQuery.support.cors ) {