private void sendResponse(HttpServerRequest req, String result) {
Buffer buff = new Buffer(result);
HttpServerResponse resp = req.response();
setHeaders(resp, "application/json", String.valueOf(buff.length()));
resp.end(buff);
}
private void setHeaders(HttpServerResponse resp, String contentType, String contentLength) {
resp.putHeader("Content-Type", contentType);
resp.putHeader("Content-Length", contentLength);