Citrix Systems 9.2 manual Configuring Named Advanced Expressions, Click Advanced Expressions

60 Citrix NetScaler Policy Configuration and Reference Guide

5.In the HTTP Request Data or HTTP Response Data field, paste the HTTP request or response that you want to parse with the expression, and click Evaluate.

Note that you must supply a complete HTTP request or response, and the header and body should be separated by blank line. Some programs that trap HTTP headers do not also trap the response. If you are copying and pasting only the header, insert a blank line at the end of the header to form a complete HTTP request or response.

6.Click Close to close this dialog box.

Configuring Named Advanced Expressions

Instead of re-typing the same expression multiple times in multiple policies, you can configure a named expression and refer to the name any time you want to use the expression in a policy. For example, you could create the following named expressions:

•ThisExpression: http.req.body(100).contains("this")

•ThatExpression: http.req.body(100).contains("that")

You can then use these named expressions in a policy expression. For example, the following is a legal expression based on the preceding examples:

ThisExpression ThatExpression

To configure a named advanced expression by using the NetScaler command line

At the NetScaler command prompt, type:

add policy expression expressionName rule

Following is an example:

add policy expression advancedNamedExpression "http.req.body(100).contains(\"the other\")"

The expression can be up to 1,499 characters.

To configure a named advanced expression by using the configuration utility

1.In the navigation pane, expand AppExpert, and then click Expressions.

2.Click Advanced Expressions.

3.Click Add.

4.Enter a name and a description for the expression.