insert X-Forwarded-Proto log TCL error

i think request matches both HTTP::respond and HTTP::header insert commands.

 configuration

[root@ve11c:Active:In Sync] config  tmsh list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:80
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 8
}
[root@ve11c:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
    when HTTP_REQUEST {
  HTTP::respond 301
  HTTP::header insert x http_cookie
}
}

 test

[root@ve11c:Active:In Sync] config  curl -I http://172.28.24.10
HTTP/1.0 301 Moved Permanently
Server: BigIP
Connection: Keep-Alive
Content-Length: 0

 /var/log/ltm

[root@ve11c:Active:In Sync] config  cat /var/log/ltm
Jun 11 16:59:35 ve11c err tmm[10748]: 01220001:3: TCL error: /Common/qux  - Operation not supported (line 1)     invoked from within "HTTP::header insert x http_cookie"