I'm on the projects that were made with Angular Universal.
I need to change blog.mywebsite.com to mywebsite.com/blog for SEO, I used proxy-config in ng start, like code below, it works correctly but it doesn't work when I run build:ssr
there is no error in the built project, just after running with node dist / server.js show website but I call mywebsite.com / mag I redirect to 404 page, while there is no problem in npm start
  "scripts": {
   "ng": "ng",
   "build": "ng build --prod",
   "start": "ng serve -o  --proxy-config src/proxy.conf.json ",
   "extract": "ng xi18n --output-path=locale",
   "build:ssr": "npm run build:client-and-server-bundles  && npm run 
    webpack:server ",
   "serve:ssr": "node dist/server.js",
   "build:client-and-server-bundles": "ng build --prod && ng run 
     angular.io-example:server",
  "webpack:server": "webpack --config webpack.server.config.js --devServer -- 
   progress --colors"
  }, 
and this is my config-proxy-file:
  {
    "/mag": {
      "target": {
      "host": "mag.mywebsite.com",
      "protocol": "http:",
      "port": 80
     },
     "secure": false,
     "changeOrigin": true,
     "logLevel": "info",
     "pathRewrite": {"^/mag" : ""}
  }
}
 
     
     
    