Need assitance creating an iRule to inclusively restrict access to a URL

use this a sample irule

1)Create Data group list as allowed-host and added the IP x.x.x.x/32

2) created below irule and called the data group list allowed-host

use string as equal or contain based on uri requirement

Code 

when HTTP_REQUEST {
 if { ( [string tolower [HTTP::uri]]  ends_with "/web/svc.html" ) } {
                 if { not ( [class match [IP::client_addr] equals allowed-host] )
                  } 
                 {
                           reject        }           }       }