HTTP Re-Direct and keep original URL in address bar

Un-comment the following lines if the site uses SSL 
  
 when CLIENT_ACCEPTED { 
             TCP::collect 5 
         }                
  
 when CLIENT_DATA { 
         if { [matchclass [TCP::payload] starts_with $::http_methods] } { 
             SSL::disable 
         } 
 } 
 when HTTP_REQUEST { 
         if { [TCP::local_port] eq "80"  } { 
             persist source_addr 1800 
             HTTP::fallback http://support.abc.com/ 
  Un-comment the next 3 lines for redirects and expand out with elseif's if needed  
     if { [HTTP::host] == "www.abc1.com" } { 
                 HTTP::redirect "http://url1.com" 
 } 
             elseif { [HTTP::host] == "www.abc2.com" } { 
                 HTTP::redirect "http://host2.com" 
 } 
             elseif { [HTTP::host] == "www.domain3.com" } { 
                 HTTP::redirect "http://www.url4.com" 
  } else { 
             pool Web_Farm_Front  
  Un-comment the net line if using redirects             
            } 
         }   elseif { [TCP::local_port] eq "443"  } { 
             HTTP::header insert "BPL-SSL" "On" 
             pool Web_Farm_Front 
         } else { 
         set srvr [findclass [TCP::local_port] $::Individual_Servers " "] 
         if { $srvr ne "" } { 
            node $srvr 80 
         }  else { 
       } 
    }   
 } 
 }