Function doXHR

core/cb.addons/require-tools/less/lessc.js:6654–6690

(url, type, callback, errback)

}

function doXHR(url, type, callback, errback) {
    var xhr = getXMLHttpRequest();
    var async = isFileProtocol ? less.fileAsync : less.async;

    if (typeof(xhr.overrideMimeType) === 'function') {
        xhr.overrideMimeType('text/css');
    }
    log("XHR: Getting '" + url + "'", logLevel.info);
    xhr.open('GET', url, async);
    xhr.setRequestHeader('Accept', type || 'text/x-less, text/css; q=0.9, */*; q=0.5');
    xhr.send(null);

    function handleResponse(xhr, callback, errback) {
        if (xhr.status >= 200 && xhr.status < 300) {
            callback(xhr.responseText,
                xhr.getResponseHeader("Last-Modified"));
        } else if (typeof(errback) === 'function') {
            errback(xhr.status, url);
        }
    }

    if (isFileProtocol && !less.fileAsync) {
        if (xhr.status === 0 || (xhr.status >= 200 && xhr.status < 300)) {
            callback(xhr.responseText);
        } else {
            errback(xhr.status, url);
        }
    } else if (async) {
        xhr.onreadystatechange = function () {
            if (xhr.readyState == 4) {
                handleResponse(xhr, callback, errback);
            }
        };
    } else {
        handleResponse(xhr, callback, errback);
    }
}

function loadFile(originalHref, currentFileInfo, callback, env, newVars) {