Your server should not be listening on localhost, but instead, on 0.0.0.0.

Additionally, make sure the port your URL is bound to is the same port the application is listening to. Something I'd try as a sanity check is to hardcode your application to listen to port 3000 and your URL to be mapped to 3000 as well.

Server host is bound to 0.0.0.0

const port = Number.parseInt(process.env.PORT ?? "3000", 10);
  console.log("PORT from env:", process.env.PORT ?? "(unset)");
  const server = serve({
    fetch: app.fetch,
    hostname: "0.0.0.0",
    port,
  });

  server.on("error", (error: NodeJS.ErrnoException) => {
    if (error.code === "EADDRINUSE") {
      console.error(
        `Port ${port} is already in use. Stop the other server or run with PORT=${
          port + 1
        } npm run server`,
      );
      process.exit(1);
    }

    console.error(error);
    process.exit(1);

That is it, issue was here, it was pointing to 3000. I changed to 8080 and redeployed, works now.

THANK YOU so much for the screenshot.

I believe the Agent can be better, it was trying to change the port and redeploy, but I think it got confused. And I lost the control when it took over