iRule for sending traffic to a different pool based on the Hostname.

Team, 

I have a virtual server with port 8899 configured as PerformanceLayer4 and FastL4. I am using couple Host names to drive thru this Virtual Server. 

I want to send the traffic to pool_magnus when the traffic is coming with host magnus.com. 

I wrote an Irule as below but its not working I can see the host coming and still going to the default pool. I think the traffic coming is not http traffic its TCP traffic. Need assistance. 🙂 

when HTTP_REQUEST {
set host [string tolower [HTTP::host]]
if { $host eq "magnus.com" } {
pool pool_magnus
}
}