Generally, the server port of a website is 80. When surfing the Internet, the browser accesses the server port 80 by default, so when surfing the Internet, we usually enter the website address directly without adding the port number. Back to this question, there are several reasons for ip+ ports: 1 A server is equipped with multiple web services, so it is distinguished by different port numbers. 2. The server of this website is configured with 8080 port by default, and the website is built with 8080 port without modification (8080 port is common in JSP pages, and the default port is set to 8080 when using tomcat server). In short, the port number is the distinction between different applications, and there may be many ways to combine the actual situation.