Redirect to a different folder hosted by a different pool

It's not clear whether you want to redirect or re-write the URI. josantia's solution re-writes the URI, but only for exactly that URI.

If you want to re-write the existing URI by simply replacing the name of the first directory, you can do it like this:

 when HTTP_REQUEST {   
     if {[getfield [string tolower [HTTP::uri]] "/" 2] equals "hello" } {   
        HTTP::uri [string map {"/hello" "/hello_1"} [HTTP::uri]]   
        pool my_other_pool    
     } else {    
        pool my_default_pool    
     }   
   }   
   

If you want to redirect the same way (preserving the URI), you can do it like this:

 when HTTP_REQUEST {   
     switch -glob [string tolower [HTTP::uri]] {   
        "/hello1*" { pool my_other_pool }   
        "/hello*" { HTTP::redirect "http://[HTTP::host]/hello_1[substr [HTTP:uri] 6]" }   
        default { pool my_default_pool }   
     }   
   }

/deb