Citrix Systems Network Router 9.2 User Manual

The following table summarizes a few of the available types of operations.

You can configure an advanced expression that contains Boolean or arithmetic 
operators and multiple atomic operations. The following compound expression 
contains a boolean AND:

http.req.hostname.eq("mycompany.com") && http.req.method.eq(post)

The following expression adds the value of two targets, and compares the result 
to a third value:

http.req.url.length + http.req.cookie.length <= 500

A compound expression can contain any number of logical and arithmetic 
operators. The following expression evaluates the length of an HTTP request on 
the basis of its URL and cookie, evaluates text in the header, and performs a 
Boolean AND on these two results: 

http.req.url.length + http.req.cookie.length <= 500 && 

http.req.header.contains("some text")

GT(<integer>)

An object's value is greater than a particular value. Following is 
an example:

http.req.content_length.gt(5)

Text operations 

Match individual strings and sets of strings with any portion 
of a target. The target can be an entire string, the start of a 
string, or any portion of text in between the start and the end 
of the string. 

For example, you can extract the string "XYZ" from 
"XYZSomeText". Or, you can compare an HTTP header 
value with an array of different strings. 

You can also transform text into another type of data. 
Following are examples:

• Transform a string into an integer value
• Create a list from the query strings in a URL
• Transform a string into a time value

Numeric operations

Numeric operations include applying arithmetic operators, 
evaluating content length, the number of items in a list, 
dates, times, and IP addresses.