Placing Resource URI into HTTP Header variable

Document ID : KB000110154
Last Modified Date : 09/08/2018
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I'm running a Web Agent and I'd like to know how to make the resource
URL available for the backend application by sending a Header through
a response. Is that feasible ? How can we achieve this ?
At first glance, if you use the Variable Type as "Request Context 
Variables", you might be able to implement this. 

Request Context Variables 

Indicates the requested resource, such as /directory_name/. 

A request context variable can capture any of this information and can 
make it available for inclusion in a policy expression or 
response. The key benefit of this type of variable is to provide 
fine-grained request context information without any programming