As you said at the end about the server, I thought it was vague and difficult, but I could easily relate to it.
In web servers, server development is used in the same way as backend development.
Enter the address to allow users to view picture files, servers, files or data specified by back-end developers.
Addressing behavior=requesting, viewing picture files or data=response
HTTP, HTTPS is a karajahae!hahaha This is a friend= router that uses a port and guides the user to a specific room depending on the address.