added more header to allow proper cors

lib/http-server/http-server.js

@@ -145,7 +145,7 @@ class HttpServer {
   }
 
   /**
-   * Express middleware returnsing a json response 
+   * Express middleware returnsing a json response
    * @param {object} req - http request object
    * @param {object} res - http response object
    * @param {function} next - next middleware
@@ -163,6 +163,8 @@ class HttpServer {
    */
   static setCrossOrigin(req, res, next) {
     res.set('Access-Control-Allow-Origin', '*')
+    res.set('Access-Control-Allow-Methods', 'GET,HEAD,POST,DELETE')
+    res.set('Access-Control-Allow-Headers', 'Content-Type,Authorization,Accept')
     next()
   }