Citrix Systems 9.2 manual Prefixes for Http Headers, Prefixes That Extract Http Headers

116 Citrix NetScaler Policy Configuration and Reference Guide

Prefixes for HTTP Headers

The following table describes expression prefixes that extract HTTP headers.

Prefixes That Extract HTTP Headers

HTTP Header Prefix	Description
HTTP.REQ.HEADER("header_name")	Returns the contents of the HTTP header
	specified by the header_name argument. The
	header name cannot exceed 32 characters.
	Note that this prefix returns the value from the
	Host header by default. To use this value as a
	host name you need to typecast it as follows:
	http.req.header("host").typecast_
	http_hostname_t
	For more information on typecasting, see
	“Transforming Text and Numbers into
	Different Data Types,” on page 169.
HTTP.REQ.FULL_HEADER("header_	Returns the contents of the HTTP header
name")	specified by the header_name argument,
	including the terminating \r\n\r\n. The
	header name cannot exceed 32 characters.
HTTP.REQ.DATE	Returns the contents of the HTTP Date
	header.The following date formats are
	recognized:
	RFC822. Sun, 06 Jan 1980 8:49:37 GMT
	RFC850. Sunday, 06-Jan-80 9:49:37 GMT
	ASCII TIME. Sun Jan 6 08:49:37 1980
	To evaluate a Date header as a date object, see
	“Advanced Expressions: Working with
	Dates, Times, and Numbers,” on page 95.
HTTP.REQ.COOKIE	(Name/Value List) Returns the contents of the
	HTTP Cookie header.
HTTP.REQ.TXID	Returns the HTTP transaction ID. The value
	is a function of an internal transaction
	number, system boot time and system MAC
	address.
HTTP.RES.HEADER("header_name")	Returns the contents of the HTTP header
	specified by the header_name argument. The
	header name cannot exceed 32 characters.
HTTP.RES.FULL_HEADER("header_	Returns the contents of the HTTP header
name")	specified by the header_name argument,
	including the terminating \r\n\r\n. The
	header name cannot exceed 32 characters.