- Handle OPTIONS request

dumbserver.js

@@ -124,6 +124,10 @@ let serveRestData = function(key, req, resp) {
             });
             break;
 			
+		case 'OPTIONS':
+		    resp.end();
+			break;
+
         case 'DELETE':
             if (store.hasOwnProperty(key)) {
                 delete store[key];