Hi, This could be because your application is listening on localhost so it's unreachable by railway proxy which lives outside the container.

You need to change the hostname to listen on all interfaces. What framework are you using ? I could provide you with the exact code change required.

I am using nodejs with fastify

That explains it. Fastify by default listens strictly on localhost. You need to explicitly tell it to listen on all interfaces.
Change your code to something like this, this is a snippet from one of my projects where I used fastify.

// Start the server
const start = async () => {
    try {
        await fastify.listen({ port: 8080, host: "::" });
    } catch (err) {
        fastify.log.error(err);
        process.exit(1);
    }
};

start();

Hey shubham, Could you take the time to try my solution ?