The problem is:

• create production build
• run production server
• open app http://localhost:3001/activities
• refresh page (works normal)
• click on Link to id 1 (works normal)
• refresh page (not work, because 1.bundle.js file not sent correctly, css too)

What is 1.bundle.js? I think it is localization file. (some info). How I can fix it?

Install

npm install

Run Dev

npm start

Open http://localhost:3000

Run Prod

npm run build
node production/production-server.js

Open http://localhost:3001