removing :443 port from URL

if you want to redirect the client to the requested host without the port, you could use below irule

 when HTTP_REQUEST { 

     Check if Host contains a colon 
    if {[HTTP::host] contains ":"}{ 
        Redirect client to requested host minus the port and preserve the original URI 
       HTTP::redirect "https://[getfield [HTTP::host] ":" 1][HTTP::uri]" 
    } 
 }