LTM - load balancing to the same web server

Just to add to Henrik's excellent idea:

when HTTP_REQUEST {    
    switch -glob [string tolower [HTTP::uri]] {        
        "/app1*" { pool app1_pool }            
        "/app2*" { pool app2_pool }            
    }        
}    

And then have a different pool and monitor(s) for each app. The beauty of this approach is that you scale up or down individual applications without affecting other services or modifying any code. If you wanted to get fancy with it, you could also do something like this:

if { [active_members app1_pool] < 1 } {    
    HTTP::respond 200 content "HTML maintenance page content"        
} else {    
    pool app1_pool        
}