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Using get_ip_from_hdr2() we can look for occurrence #X or #-X and extract the IP it contains. This is typically designed for use with the X-Forwarded-For header. Using "usesrc hdr_ip(name,occ)", it becomes possible to use the IP address found in <name>, and possibly specify occurrence number <occ>, as the source to connect to a server. This is possible both in a server and in a backend's source statement. This is typically used to use the source IP previously set by a upstream proxy.