+ // Main method
+ ajax: function( url , options ) {
+
+ // If options is not an object,
+ // we simulate pre-1.5 signature
+ if ( typeof( options ) !== "object" ) {
+ options = url;
+ url = undefined;
+ }
+
+ // Force options to be an object
+ options = options || {};
+
+ var // Create the final options object
+ s = jQuery.extend( true , {} , jQuery.ajaxSettings , options ),
+ // jQuery lists
+ jQuery_lastModified = jQuery.lastModified,
+ jQuery_etag = jQuery.etag,
+ // Callbacks contexts
+ // We force the original context if it exists
+ // or take it from jQuery.ajaxSettings otherwise
+ // (plain objects used as context get extended)
+ callbackContext =
+ ( s.context = ( "context" in options ? options : jQuery.ajaxSettings ).context ) || s,
+ globalEventContext = callbackContext === s ? jQuery.event : jQuery( callbackContext ),
+ // Deferreds
+ deferred = jQuery.Deferred(),
+ completeDeferred = jQuery._Deferred(),
+ // Status-dependent callbacks
+ statusCode = s.statusCode || {},
+ // Headers (they are sent all at once)
+ requestHeaders = {},
+ // Response headers
+ responseHeadersString,
+ responseHeaders,
+ // transport
+ transport,
+ // timeout handle
+ timeoutTimer,
+ // Cross-domain detection vars
+ loc = document.location,
+ protocol = loc.protocol || "http:",
+ parts,
+ // The jXHR state
+ state = 0,
+ // Loop variable
+ i,
+ // Fake xhr
+ jXHR = {
+
+ readyState: 0,
+
+ // Caches the header
+ setRequestHeader: function(name,value) {
+ if ( state === 0 ) {
+ requestHeaders[ name.toLowerCase() ] = value;
+ }
+ return this;
+ },
+
+ // Raw string
+ getAllResponseHeaders: function() {
+ return state === 2 ? responseHeadersString : null;
+ },
+
+ // Builds headers hashtable if needed
+ getResponseHeader: function( key ) {
+
+ var match;
+
+ if ( state === 2 ) {
+
+ if ( !responseHeaders ) {
+
+ responseHeaders = {};
+
+ while( ( match = rheaders.exec( responseHeadersString ) ) ) {
+ responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
+ }
+ }
+ match = responseHeaders[ key.toLowerCase() ];