Citrix Systems 9.2 manual Returns the domain name part of the host name. For, Case insensitive

68Citrix NetScaler Policy Configuration and Reference Guide

HTTP Expression Prefixes that Return Text

Prefix	Description
HTTP.REQ.HOSTNAME.	Returns the domain name part of the host name. For
DOMAIN	example, if the host name is www.myhost.com or www.
	myhost.com:8080, the domain is myhost.com.
	Returns incorrect results if the host name has an IP
	address. For information on expressions for IP
	addresses, see “Advanced Expressions: IP and MAC
	Addresses, Throughput, VLAN IDs,” on page 149.
	All text operations that you specify after this prefix are
	case insensitive.
HTTP.REQ.HOSTNAME.	Returns the server name part of the host name. If the
SERVER	host name is www.myhost.com or www.myhost.
	com:8080, the server is www.myhost.com.
	All text operations that you specify after this prefix are
	case insensitive.
HTTP.REQ.METHOD	Returns the value of the METHOD in an HTTP request,
	or matches the method type if you provide it as an
	argument, for example, http.req.method.
	eq(get). If you enclose the argument in quotes,
	evaluation is case-sensitive.
HTTP.REQ.URL	Returns the HTTP URL.
HTTP.REQ.URL.HOSTNAME	Returns the host name in the HTTP URL.
	Do not use this prefix in bidirectional policies.
	Note that there are two similar prefixes that return host
	names, as follows:
	• HTTP.REQ.HOSTNAME returns the host name
	from the URL if there is one; otherwise, it returns
	the value in the last occurrence of the Host header.
	• HTTP.REQ.HEADER("Host") only returns the
	value from the Host header. To use this value as a
	host name you must typecast this string, as
	illustrated in the following example: 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.