HTTP Port

The HTTP port is the port at which your service is listening for incoming HTTP requests. By default, this is 8080, but you can customize the default part. The load balancer for your service will route requests that come in from the HTTP and HTTPS ports (80 and 443, respectively) to the HTTP port.

Note
The service must bind to and expose the HTTP port on the network interface 0.0.0.0 , rather than on the localhost (localhost) or loopback interface (127.0.0.1).
See some common troubleshooting techniques for App Platform.