Citrix Systems Network Router 9.2 User Manual

The following table provides examples of advanced expressions that you can use 
as the basis for your own advanced expressions.
Examples of Advanced Expressions

Look at the method used in the 
HTTP request.

http.req.method.eq(post)

http.req.method.eq(get)

Check the Cache-Control or Pragma 
header value in an HTTP request 
(req) or response (res).

http.req.header("Cache-Control").cont

ains("no-store")

http.req.header("Cache-Control").cont

ains("no-cache")

http.req.header("Pragma").contains("n

o-cache")

http.res.header("Cache-Control").cont

ains("private")

http.res.header("Cache-Control").cont

ains("public")

http.res.header("Cache-Control").cont

ains("must-revalidate")

http.res.header("Cache-Control").cont

ains("proxy-revalidate")

http.res.header("Cache-Control").cont

ains("max-age")

Check for the presence of a header 
in a request (req) or response 
(res).

http.req.header("myHeader").exists

http.res.header("myHeader").exists