XMLHttpRequest を使うサンプルを書きなおしてみた感じ

gistfile1.txt

function getXMLHttpRequest() {
    if ( _root.defined( `XMLHttpRequest ) )
        return new XMLHttpRequest();
    else {
        try {
            return ActiveXObjectFactory.createObject( "MSXML2.XMLHTTP.3.0" );
        } catch ( e : Exception ) {
            return null;
        }
    }
}


function onReadyStateChange(ae : AsyncEvent) {
    if ( ae.sender.readyState == ReadyState.DONE ) {
        if ( ae.sender.status == 200 )
            alert( ae.sender.responseText );
    }
}


let request = getXMLHttpRequest();

if ( request != null ) {
    request.open( "GET", "http://localhost/sample.xml", true );
    request.addEventListener( AsyncEvent.READY_STATE_CHANGE, onReadyStateChange, false );
    request.send();
} else
    alert( "XMLHttpRequest not supported." );