The customer had a requirement wherein he wanted to insert the IP address of the backend service (in an HTTP response) to which the NetScaler forwarded the HTTP request after load-balancing.
Although inserting this information can be considered a security risk, it can be useful during diagnosis and testing.

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Instructions

Configuration
 
To achieve the above requirement we need to configure the below rewrite policy.
 
How to configure policy from GUI

1. Create a Rewrite action as shown below



2. Create a Rewrite policy as shown below



3. Bind the Rewrite policy to the necessary Load balancing Virtual Server as a “Response Rewrite”





How to configure the policy from CLI
 
add rewrite action INSERT_BACKEND_IP_ACTION insert_http_header BACKEND-IP SERVER.IP.SRC
add rewrite policy INSERT_BACKEND_IP_POLICY HTTP.RES.IS_VALID INSERT_BACKEND_IP_ACTION
bind lb vserver IIS-LB -policyName INSERT_BACKEND_IP_POLICY -priority 100 -gotoPriorityExpression END -type RESPONSE

How to Verify
 
Access the VIP from client browser, use any tool that can capture HTTP requests (WireShark / Fiddler / Developer Tools on a browser). In the response from NetScaler you can find the HTTP header inserted as BACKEND IP as shown below