What IP should the web application listen to?

Question

Computer networks

There is a server. I can't figure out which IP the web application should listen to?
0.0.0.0 or do you still need to specify the current server IP? What will be the difference?

Answer 1

0.0.0.0 means all interfaces, and if specific interface types are specified, it will only listen there.

Answer 2

0.0.0.0 - bind TO ALL INTERFACES
127.0.0.x - only to LOCAL: localhost
10.xx.xx.xx or 172.16.xx.xx or 192.168.0.xx - bind to LOCAL PRIVATE
xx.xx.xx.xx - to ONE PARTICULAR SELECTED
Web application must listen to the EXTERNAL interface or INTERNAL, to which traffic comes from the outside through the PROXY bridge.