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When a client program (such as a browser) connects to a server, it opens a socket.  And (unless the program specifies one, which is very rare), the operating system assigns a unique port number to the socket.  This will commonly be in the range 1000-2000.  The source IP is, of course, the address of the client host.  The server determines the destination ...


This is simpler if you look up some layers. Just remembering the life cycle of an HTTP request: The client browser initiates a socket connection to web server A request at http standard is sent to the server. The server processes the request and returns a response in the HTTP standard to the customer. The client browser receives the response. The ...

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