Citrix Systems 9.2 Invoking an HTTP Callout Policy

Chapter 11 Advanced Policies: Sending HTTP Service Callouts to Applications 193
•calloutName is the name of the HTTP callout policy that you are
configuring.
•argument is one of the arguments that you supplied when you configured
the callout, including returnType, parameters, fullReqEx, and so
on.
After unsetting the configuration, use the set command to apply any new
settings.
Examples
unset httpCallout myCallout -parameters
unset httpCallout myCallout -headers
unset httpCallout myCallout -resultExpr
To delete a callout policy using the NetScaler command line
At a NetScaler command prompt, type:
rm policy httpCallout calloutName
Where calloutName is the name of the HTTP callout policy that you are deleting.
Example
rm policy httpCallout myCallout
To view a callout policy using the NetScaler command line
At a NetScaler command prompt, type:
show httpCallout
Invoking an HTTP Callout Policy
You can invoke the callout from a policy or another entity that uses advanced
expressions (for example, a Rewrite action). For a list of features that support
HTTP callouts, see “About Calling Out to an External Application,” on page 186.
You can invoke an HTTP callout policy by including the following in an
advanced expression:
SYS.HTTP_CALLOUT(calloutName)
Only HTTP.RES based advanced expressions can be used to build the result.
Note that you must know the return type of the HTTP callout policy that you are
invoking. The expression must conform to the return type of the invoked policy.
For example, if the return type of the HTTP callout policy is TEXT, the following
expression is valid: