Fastify with Heroku - heroku

Question

I am having a simple Fastify server hosted with Heroku. But, it seems not working ! But, it seemed all right during the development! The error I get is: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch. Full error I am getting:
Here is the code I am using:
server.js:
const fastify = require("fastify")();
const path = require("path");
fastify.register(require("fastify-static"), {
root: path.join(__dirname, "/"),
});
fastify.get("/", function (req, reply) {
reply.sendFile("index.html");
});
fastify.listen(process.env.PORT || 5000, (err) => {
if (err) throw err;
console.log(`server listening on ${fastify.server.address().port}`);
});
package.json:
{
"name": "test1",
"version": "1.0.0",
"description": "",
"main": "server.js",
"engines": {
"node": "15.11.x"
},
"scripts": {
"start": "node server.js",
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"dependencies": {
"fastify": "^3.14.0",
"fastify-static": "^4.0.1"
}
}
Sometimes, the site even doesn't load!
Any help is greatly appreciated !
Thanks !

Answer 1

That's an issue with the library. For other libraries (express, django, etc..) specifying the address is not necessary.
See https://github.com/fastify/fastify/issues/709
Change:
.listen(process.env.PORT)
to:
.listen(process.env.PORT, '0.0.0.0')

Answer 2

When I use both nodemon as local server and Heroku for production the following works for me:
await fastify.listen(process.env.PORT, process.env.HOST || '0.0.0.0');
and in package.json
"dev": "PORT=${PORT:=3000} HOST=${HOST:=localhost} nodemon"