Server Terminates The Connection

It is server's responsbility to terminate the TCP/IP connection with the browser after it responds to the browser's request, however both the browser and the web server must manager an unexpected closing of a connection as well. In other words, if the user clicks on the Browser's STOP button, the browser must close the connection.

Also a computer crash  by either a browser or a web serer must be recognized by the surviving computer, which in turn will close the connection.