label: Web Server,Port 80,availability,HTTP,apache httpd,IIS, nginx, Internet Information Server, SQL Server Reporting Services
You can refer to the above URL to understand the HTTP protocol and port
View the command of the process occupying port 80, that is, enumerate the network occupation to obtain the process ID PID
netstat -ano|findstr "80"
Then check the progress of the PID in the result of the above command in the Windows Task Manager and solve it.
If it is occupied by the system process with PID 4, it is the system occupation of windows and needs to be further checked.
It is usually apache httpd server，Internet Information Server occupied.
Another possibility is SQL Server Reporting Services occupation
Workaround: Stop this service in the server manager of the system.