: IP Address headers (Remote_Addr) - When is this header sent by the browser? I want to know when a browser includes the header - Remote_Addr in the HTTP request. I observed the request sent

@Ann8826881

In client-server applications, the IP address of the client (i.e., the browser) is sent via the socket connection (the request) to the server (e.g., Apache). If the client is using a proxy server however, that may be the proxy's IP address instead of the client's IP.

Remote_Addr is an ENV returned by the server and available to server-side scripts/applications, not the client browser.

In PHP, you can use something like $_SERVER['REMOTE_ADDR'] to obtain the IP address of the client. In Perl you can use something like $ENV{'REMOTE_ADDR'};

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