proxy in angular universal

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

blog.mywebsite.com

mywebsite.com/blog

ng start

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

node dist / server.js

mywebsite.com / mag

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" : ""}
}
}


dist / server.js

mywebsite.com / mag

npm start

proxy

ng serve

ng build

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