Localhost indicates the computer currently in use or its IP address. This address is used when you need to connect to a remote computer with a computer that is currently in use. If both servers and client programs are on the same system (for example, to test a web server), the URL can be used in 127.0.0.0/8 format, such as http://127.0.0.1/ or http: // localhost /.
To enable the computer to access via TCP / IP, a virtual network card called a loopback device is created and the outgoing information is routed to this address.
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