functions example for SO comment.

_note.txt

I currently use https://us-central1-project-name.cloudfunctions.net/users/123 in production 
and want to switch to using https://example.com/users/123

Is there any way to workaround, or do you have any suggestions 
to keep old URLs at *.cloudfunctions.net working for backwards compatibility ? 
Otherwise default URL gets changed to https://us-central1-project-name.cloudfunctions.net/users/users/123 ...

index.js

const functions = require("firebase-functions");
    
exports['users'] = functions.https.onRequest(require('users.js));

NEW-users.js

const app = require("express")();

app.get("/users/:id", (req, res) => {
  // return user json by id
}

user.js

const app = require("express")();

app.get("/:id", (req, res) => {
  // return user json by id
}