Insert header into response based on pool selected in request.

You could do this in HTTP_RESPONSE. Here's a simple example which inserts the server IP:port in a header named SERVER_INFO:

when HTTP_RESPONSE {

   HTTP::header insert SERVER_INFO "[IP::server_addr]:[TCP::server_port]"
}

If you wanted to map the server IP:port to a name or some other value, you could create the mapping in a string datagroup and then use the class command (in v10) or the findclass command (in v9) to do the lookup.

Aaron