droppy.diff

archive = archiver(type, {zlib: { level: config.zipLevel }, catchEarly: false});
archive.on("error", function (error) { log.error(error); });
archive.pipe(res);

utils.walkDirectory(zipPath, true, function (error, paths) {
    paths = paths.filter(function (s) { return s !== ""; });
    if (error) log.error(error);
    (function read(currentPath) {
        if (currentPath[currentPath.length - 1] !== "/")
            archive.file(currentPath, {name: removeFilePath(currentPath)}, next);
        else
            archive.append("", { name: removeFilePath(currentPath) }, next);

        function next(error) {
            if (error) log.error(error);
            if (paths.length) {
                read(paths.pop());
            } else {
-                archive.finalize(function (error) {
-                    if (error) log.error(error);
-                    res.end();
-                });
+                archive.finalize();
            }
        }
    })(paths.pop());
});