Explicitly specified that only original POST can be converted into different request method

Author: Vikas Agarwal

src/app.js

@@ -13,7 +13,9 @@ import analytics from './events/analytics';
 const app = express();
 
 // allows overriding HTTP Method
-app.use(methodOverride('X-HTTP-Method-Override'))
+// both arguments to the methodOverride are optional because they are the default
+// values, but we are specifying them to avoid any future change in defaults
+app.use(methodOverride('X-HTTP-Method-Override', {methods : ['POST'] }))
 
 // =======================
 // configuration =========