To create a server is to allow the files I've created to be shown to others. The http and https have security differences and are connected to 80 ports and 443 ports, respectively. A user's request enters the port and the port looks at the url behind it and shows the information the user wants. Guide users to their respective rooms according to address = routers The server is created with folders and JavaScript files (router can also be created as js files). (via node.js) The server's address can be obtained and made accessible. It is inconvenient to use ip address, so it can be connected to the domain and used comfortably.