Understanding the X-Forwarded-For HTTP Header – Security Risks and Best Practices

The article explains the functioning of the X-Forwarded-For HTTP header, which is used to identify the original IP address of a client connected to a web server through a proxy or load balancer. It highlights the security risks associated with this header, including the possibility of spoofing by attackers to mask their true IP address. The article also proposes best practices to mitigate these risks, such as validating and verifying X-Forwarded-For headers.