The arg keyword was missing and therefore not present in the man page.
Closes #12611
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Long: haproxy-clientip
+Arg: <IP address>
Help: Sets client IP in HAProxy PROXY protocol v1 header
Protocols: HTTP
Added: 8.2.0
Otherwise, any string can be accepted for the client IP and get sent.
It replaces --haproxy-protocol if used, it is not necessary to specify both flags.
-
-This option is primarily useful when sending test requests to
-verify a service is working as intended.