Citrix Systems 9.2 manual Following is an example of configuring a caching policy

58 Citrix NetScaler Policy Configuration and Reference Guide

You must also use a backslash to escape question marks and other backslashes on the command line. For example, the expression http.req.url.contains(“\?”) requires a backslash so that the question mark is parsed. Note that the backslash character will not appear on the command line after you type the question mark. On the other hand, if you escape a backslash (for example, in the expression 'http.req.url.contains("\\\\http")'), the escape characters are echoed on the command line.

To make an entry more readable, you can escape the quotation marks for an entire expression. At the start of the expression you enter the escape sequence “q” plus one of the following special characters: /{<~$^+=&%@`?.

You enter only the special character at the end of the expression, as follows:

q@http.req.url.contains("sometext") && http.req.cookie.exists@

q~http.req.url.contains("sometext") && http.req.cookie.exists~

Note that an expression that uses the { delimiter is closed with }.

For some features (for example, Integrated Caching and Responder), the configuration utility’s policy configuration dialog box provides a secondary dialog box for configuring expressions. This dialog box enables you to choose from drop-down lists that show the available choices at each point during expression configuration. You cannot use arithmetic operators in these configuration dialogs, but most other advanced expression features are available. To use arithmetic operators , write your expressions in free-form format.

To configure an advanced policy rule by using the NetScaler command line

At the NetScaler command prompt, type:

add cachednsrewritecs policy policyName -rule expression

featureSpecificParameters

Following is an example of configuring a caching policy:

add cache policy cacheReports -rule q~http.req.url.query.value("actionoverride").contains("branchReport s")~ -action cache

To configure an advanced policy expression by using the configuration utility

1.In the navigation pane, click the name of the feature where you want to configure a policy, for example, you can select Integrated Caching, Responder, DNS, Rewrite, or Content Switching, and then click Policies.

2.Click Add.

3.For most features, click in the Expression field. For Content Switching, click Configure and then click Advanced Syntax.