gistfile1.js

    var GOOGLE_READER_PROXY_URL = 'http://www.google.com/reader/atom/feed/'
    function feedRequest(href, feedCallback) {
        httpRequest(href, callback);
        function callback(e) {
            if (e.status == '403') {
                postError('feed access denied. [' + e.status + '] ' + e.statusText);
                if (href.indexOf(GOOGLE_READER_PROXY_URL) != 0) {
                    var url = GOOGLE_READER_PROXY_URL + encodeURIComponent(href);
                    postError('retry to Google Reader [' + url + ']');
                    feedRequest(url, feedCallback);
                    return;
                }
            }
            if (e.readyState < 4) { // timeout.
                var feedObj = {
                    title : href,
                    link : href,
                    description: NDR.lang.ABORTED_CONNECTION,
                    items : [],
                    url : href,
                    status : 'timeout'
                };
            }
            else if (e.responseText == "") {
                var feedObj = {
                    title : href,
                    link : href,
                    description: NDR.lang.MISSING_DATA,
                    items : [],
                    url : href,
                    status : 'nodata'
                };
            }
            else if (!/^\s*</.test(e.responseText)) { // deleted mylist. etc.
                var feedObj = {
                    title : href,
                    link : href,
                    description: NDR.lang.INVALID_FEED + '\n(' + /\s*(.*)$/m.exec(e.responseText)[0].substring(0, 300) + ')',
                    items : [],
                    url : href,
                    status : 'invalid'
                };
            }
            else {
                var feedObj = parseFeedObjectFromString(e.responseText);
                feedObj.url = href;
                feedObj.status = 'ok';
                if (!feedObj.link) {
                    feedObj.link = href;
                }
            }
            feedCallback(feedObj);
        };
    }