In mi backend i use express:
```js
console.log("Server on");
const port = Number(process.env.PORT) || 3000;

return app.listen(port, "::", () => {
console.log(Server listening on [::]${port});
});```

in my frontend , i crete a domain
and its working

how can i fixed?

Fun fact: I had to use
in the packagejson in the backend
"build": "rm -rf ./dist && tsc || true",
and in the frontend
"build": "react-scripts build || true",

Why would the build stop if it had errors, even if my tsconfig was:

```"compilerOptions": {
    "noEmitOnError":` false,```

its a mono repo

When you are referencing something on the private network, you need the URL to be :port number so, for your example, your frontend_domain should be app-frontend.railway.internal:3000 and your caddy config should reference the variable

This caddy repo asks you for it separately, I tried the older one that was like that and it doesn't work

the caddy

this is the repo

https://github.com/railwayapp-templates/caddy-reverse-proxy

yep the template does ask for the domain and port as separate variables.

in think i fixed

its deploying

i was a error with serve, not sure

in a few minutes i discover

the issue here is that your frontend is not listening on ipv6.

is the deploy is succes

yes

i use serve

you would want to be using caddy

1. remove the build and start commands you have set in the service settings.

2. - copy the nixpacks.toml and Caddyfile from this repo into yours.