Would you care to give an example? I.E. what's your preferred method to resolve this?

Perhaps, provide

APP_BIND=127.0.0.1

in .env and simply

app.listen(process.env.APP_PORT, () => {

becomes

app.listen(process.env.APP_PORT, process.env.APP_BIND, () => {

Ok. I'll be happy to accept a PR that looks for the APP_HOST environmental variable. If present, it binds to that host. Otherwise, the current behavior stays the same.

I'm suggesting APP_HOST in lieu of APP_BIND because its also the argument name for server.listen() in the docs and may be more clear to users.

Fixed in #77. Only thing left here:

• Add APP_HOST to docs