I have try to deploy my react app that have a backend and frontend on Plesk that will use MySQL, v5.5.62 and I have getting this 404 error that is saying the endpoint is not found.

  Login.jsx:34  GET https://my-url.com/users/count 404 (Not Found) 

and after some times it will change the error message to 500 server not found which will display the Phusion Passenger page saying

  Web application could not be started by the Phusion Passenger(R) application server 

I have created the database twice and the Plesk give me the database ip-Adress:3306 (default for MySQL, v5.5.62) and I have entered my own DB name test2_db and username test2_db_user

can you help me please

how can i make Shure that the database is connected to my react app that have this folder structure

root │ 
├── backend 
│   ├── upload 
│   ├── .env 
│   ├── package-lock.json 
│   ├── package.json 
│   ├── server.js 
│   └── node_modules 
│ 
│
├── build 
├── node_modules 
├── public 
├── src 
│    ├── components 
│    ├── app.js 
│    ├── index.js 
│    ├── reportWebVitals.js 
│    └── setupTests.js 
├── package.json 
└── package-lock.json