Citrix Systems Network Router 9.2 User Manual

The following table describes operations that you can specify with the prefixes 
for HTTP headers. 

Note that if the same operation is also used to evaluate text, the header-based 
operation always overrides any text-based operation. For example, the AFTER_
STR

 operation, when applied to a header, overrides text-based AFTER_STR 

operations for all instances of the current header type.

HTTP.RES.SET_COOKIE.

COOKIE("name", integer).

VERSION 

or

HTTP.RES.SET_COOKIE2.

COOKIE("name", integer).

VERSION

Returns the value of Version field of the nth 
cookie as a decimal integer. 

A string of zero length is returned if the Port 
field or its value is absent.

HTTP.RES.TXID

Returns the HTTP transaction ID. The value 
is a function of an internal transaction 
number, system boot time and system MAC 
address.

http header.EXISTS

Returns a Boolean TRUE if an instance of the specified 
header type exists. 

Following is an example:

http.req.header("Cache-Control").exists