Citrix Systems 9.2 Request, insert an, NS-Client header, Then modify the insert, Example, with

Appendix B Summary Examples of Advanced Expressions and Policies 243

Examples of Advanced Expressions and Policies

Purpose	Example
Remove old headers from	add rewrite action del_x_forwarded_for
a request, insert an	delete_http_header x-forwarded-for
NS-Client header, and	add rewrite action del_client_ip
then modify the “insert
header” action so that the	delete_http_header client-ip
value of the inserted	add rewrite policy
header contains the client
IP values from the old	check_x_forwarded_for_policy
headers and the	'HTTP.REQ.HEADER("x-forwarded-for").EXISTS'
NetScaler’s connection IP	del_x_forwarded_for
address.	add rewrite policy check_client_ip_policy
Note that this example
	'HTTP.REQ.HEADER("client-ip").EXISTS'
repeats the previous	del_client_ip
example, with the
	add rewrite action insert_ns_client_header
exception of the final set
rewrite action.	insert_http_header NS-Client 'CLIENT.IP.SRC'
	add rewrite policy insert_ns_client_policy
	'HTTP.REQ.HEADER("x-forwarded-for").EXISTS
	HTTP.REQ.HEADER("client-ip").EXISTS'
	insert_ns_client_header
	bind rewrite global
	check_x_forwarded_for_policy 100 200
	bind rewrite global check_client_ip_policy
	200	300

bind rewrite global insert_ns_client_policy 300 END

set rewrite action insert_ns_client_header -stringBuilderExpr 'HTTP.REQ.HEADER("x-forwarded-for").VALUE(0)

+" " + HTTP.REQ.HEADER("client-ip").VALUE(0)

+" " + CLIENT.IP.SRC' -bypassSafetyCheck YES