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copied!<p>Browsing the <a href="http://code.jquery.com/jquery-1.4.4.js" rel="nofollow">source code</a>, it appears that $.ajax() detects remote URLs and replaces AJAX (XMLHttpRequest ) with good old script tags:</p> <pre><code> // Build temporary JSONP function if ( s.dataType === "json" && (s.data && jsre.test(s.data) || jsre.test(s.url)) ) { jsonp = s.jsonpCallback || ("jsonp" + jsc++); // Replace the =? sequence both in the query string and the data if ( s.data ) { s.data = (s.data + "").replace(jsre, "=" + jsonp + "$1"); } s.url = s.url.replace(jsre, "=" + jsonp + "$1"); // We need to make sure // that a JSONP style response is executed properly s.dataType = "script"; // Handle JSONP-style loading var customJsonp = window[ jsonp ]; window[ jsonp ] = function( tmp ) { if ( jQuery.isFunction( customJsonp ) ) { customJsonp( tmp ); } else { // Garbage collect window[ jsonp ] = undefined; try { delete window[ jsonp ]; } catch( jsonpError ) {} } data = tmp; jQuery.handleSuccess( s, xhr, status, data ); jQuery.handleComplete( s, xhr, status, data ); if ( head ) { head.removeChild( script ); } }; } </code></pre> <p>[...]</p> <pre><code> // Matches an absolute URL, and saves the domain var parts = rurl.exec( s.url ), remote = parts && (parts[1] && parts[1].toLowerCase() !== location.protocol || parts[2].toLowerCase() !== location.host); // If we're requesting a remote document // and trying to load JSON or Script with a GET if ( s.dataType === "script" && type === "GET" && remote ) { var head = document.getElementsByTagName("head")[0] || document.documentElement; var script = document.createElement("script"); if ( s.scriptCharset ) { script.charset = s.scriptCharset; } script.src = s.url; // Handle Script loading if ( !jsonp ) { var done = false; // Attach handlers for all browsers script.onload = script.onreadystatechange = function() { if ( !done && (!this.readyState || this.readyState === "loaded" || this.readyState === "complete") ) { done = true; jQuery.handleSuccess( s, xhr, status, data ); jQuery.handleComplete( s, xhr, status, data ); // Handle memory leak in IE script.onload = script.onreadystatechange = null; if ( head && script.parentNode ) { head.removeChild( script ); } } }; } // Use insertBefore instead of appendChild to circumvent an IE6 bug. // This arises when a base node is used (#2709 and #4378). head.insertBefore( script, head.firstChild ); // We handle everything using the script element injection return undefined; } </code></pre>

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