firebase remove function name from url - firebase

Question

I have a simple express app like this.
const express = require("express");
var app = express();
app.get("/", (req, res)=>{
...handle request...
});
...
exports.app = functions.https.onRequest(app);
I am deploying on firebase. and when I deploy it it creates a new route by the name of the function like this: https://us-central1-[projectname].cloudfunctions.net/app
this is because I put exports.app = functions.https.onRequest(app);
so how can I deploy and make it work without the /app at the end? I need this because I am having issue with the references on my front end which use routes like "/login", which in this case won't work since it had added app requiring all routes to be like "/app/login"
I even tried export default app but no luck.
how can I deploy with out the function name as a route?

Answer 1

Removing /[exportname] from the first part of a URL hosted on cloudfunctions.net is not possible as this is how the functions are triggered.
Ideally rather than serve resources from the cloudfunctions.net domain, you place your functions behind Firebase Hosting where you can instead use a URL like https://yourapp.example.com/login which will play nicely with Express.
However, if you wish to call https://us-central1-[projectname].cloudfunctions.net/app/login and have it behave as if it was called from https://us-central1-[projectname].cloudfunctions.net/login, you can make use of a conditional URL rewrite. The example below will strip /app from the URL if-and-only-if the hostname ends in cloudfunctions.net and the URL also starts with "/app", then handing over to the other routes.
import express from "express";
function removePathForCloudFunctionsDomain(path) {
return function(req, res, next) {
const rawUrl = req.url; // stash original URL
// do nothing if not on cloudfunctions.net or path doesn't match
if (!req.hostname.endsWith("cloudfunctions.net") || !rawUrl.startsWith(path)) {
return next();
}
// if here, trim path off of the request's URL
req.url = req.originalUrl = rawUrl.slice(path.length);
// hand over to other app.get(), app.use(), etc.
next('route');
}
}
const app = express();
app.use(removePathForCloudFunctionsDomain("/app"));
/* other routes */
export app;