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                this.transport.setRequestHeader( "Connection", "close" );
            }
        }

/* TODO Add support for this back in later
        if (this.options.requestHeaders)
            requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);
*/
    };

    // XXX This confuses me a little ... how are undefined and 0 considered a success?
    HTTP.Request.prototype.isSuccess = function () {
        return this.transport.status == undefined
            || this.transport.status == 0
            || (this.transport.status >= 200 && this.transport.status < 300);
    };

    HTTP.Request.prototype.onStateChange = function() {
        var readyState = this.transport.readyState;
        if (readyState != 1) {
            this.respondToReadyState( this.transport.readyState );
        }
    };

    HTTP.Request.prototype.respondToReadyState = function( readyState ) {
        var event = HTTP.Request.EventNames[readyState];

        if (event == "complete") {
            var func = this.getOption( "on" + this.transport.status );
            if ( ! func ) {
                if ( this.isSuccess() ) {
                    func = this.getOption( "onsuccess" );
                }
                else {
                    func = this.getOption( "onfailure" );
                }
            }

            if ( func ) {
                ( func )( this.transport );
            }
        }

        if ( this.getOption( "on" + event ) )
            ( this.getOption( "on" + event ) )( this.transport );

        /* Avoid memory leak in MSIE: clean up the oncomplete event handler */
        if (event == "complete") {
            this.transport.onreadystatechange = function (){};
        }
    };

    HTTP.Request.VERSION = 0.03;
}

if ( typeof( HTTP.Request.Transport ) == "undefined" ) {
    if ( window.XMLHttpRequest ) {
        HTTP.Request.Transport = window.XMLHttpRequest;
    }
    // This tests for ActiveXObject in IE5+
    else if ( window.ActiveXObject && window.clipboardData ) {
        var msxmls = new Array(
            "Msxml2.XMLHTTP.5.0"
           ,"Msxml2.XMLHTTP.4.0"
           ,"Msxml2.XMLHTTP.3.0"
           ,"Msxml2.XMLHTTP"
           ,"Microsoft.XMLHTTP"
        );
        for ( var i = 0; i < msxmls.length; i++ ) {
            try {
                new ActiveXObject(msxmls[i]);
                HTTP.Request.Transport = function () {
                    return new ActiveXObject(msxmls[i]);
                };
                break;
            }
            catch(e) {
            }
        }
    }

    if ( typeof( HTTP.Request.Transport ) == "undefined" ) {
        // This is where we add DIV/IFRAME support masquerading as an XMLHttpRequest object
    }

    if ( typeof( HTTP.Request.Transport ) == "undefined" ) {
        throw new Error("Unable to locate XMLHttpRequest or other HTTP transport mechanism");
    }
}