React http-proxy-middleware It works locally but not on the main server

Question

I work locally with http-proxy-middeware and there is no problem After building the project with npm run build When I transfer the project to the main server, the proxy does not work anymore and gives a 404 error Thank you for your advice`

const { createProxyMiddleware } = require('http-proxy-middleware');

module.exports = function(app) { app.use( '/api', createProxyMiddleware({ target: 'https://backend_api.com', changeOrigin: true }) ); };