Fixed http code

backend-services/user-service/controllers/appController.js

@@ -140,7 +140,7 @@ export async function getUser(req,res){
 
     try {
 
-        if(!username) return res.status(501).send({error: "Invalid Username"});
+        if(!username) return res.status(401).send({error: "Invalid Username"});
 
         UserModel.findOne({username}, function(err, user){
             if(err) return res.status(500).send({err});