Redirect domain.com to www.domain.com

 
 when HTTP_REQUEST { 
  
     Check if there was a host header value doesn't start with www. and does start with an alphabet character 
    if { not ([string match -nocase www.* [HTTP::host]]) && [string match -nocase a-z* [HTTP::host]]}{ 
  
       HTTP::redirect "http://www.[HTTP::host]" 
    } 
 } 
 

 
 when HTTP_REQUEST { 
  
     Check if the host header value isn't www.domain.com 
    if { not ([string tolower [HTTP::host]] eq "www.domain.com") }{ 
  
       HTTP::redirect "http://www.domain.com" 
    } 
 }