Citrix Systems 9.2 manual Expression Prefixes for VPNs and Clientless

76Citrix NetScaler Policy Configuration and Reference Guide

HTTP Expression Prefixes that Return Text

Prefix	Description
HTTP.REQ.URL.PATH.	Ignores the empty elements in the list. For example, if
IGNORE_EMPTY_ELEMENTS	the element delimiter in the list is a comma, the
	following list has an empty element following a=10:
	a=10,b=11, ,c=89
	The element following b=11 is not considered an empty
	element.
	As another example, consider the following header:
	Cust_Header : 123,,24, ,15
	The following expression returns a value of 4:
	http.req.header("Cust_Header").typecast_
	list_t(',').ignore_empty_elements.count
	The following expression returns a value of 5:
	http.req.header("Cust_Header").typecast_
	list_t(','). count
HTTP.REQ.URL.QUERY.	This method ignores the empty elements in a name-
IGNORE_EMPTY_ELEMENTS	value list. For example, if the list delimiter is a
	semicolon, the following list has an empty element
	following a=10:
	a=10;;b=11; ;c=89
	The element following b=11 is not considered an empty
	element.
	For example, consider the following header:
	Cust_Header : a=1;;b=2; ;c=3
	The following expression returns a value of 4:
	http.req.header("Cust_Header").typecast_
	nvlist_t('=',';').ignore_empty_elements.
	count
	The following expression returns a value of 5:
	http.req.header("Cust_Header").typecast_
	nvlist_t('=',';'). count

Expression Prefixes for VPNs and Clientless

VPNs

The advanced expression engine provides prefixes that are specific to parsing VPN or Clientless VPN data. This data includes the following:

•Host names, domains, and URLs in VPN traffic.

•Protocols in the VPN traffic.