Google Analytics

when HTTP_REQUEST { 
 if { [HTTP::host] eq "www.domain.com"} { 
 when RULE_INIT {   
  replace the value of the _uacct variable with your Google Analytics account.   
 set analytics " 
  
  
 " 
 set exist_search "urchinTracker()" 
 } 
 when HTTP_REQUEST {   
  Don't allow data to be chunked   
 if { [HTTP::version] eq "1.1" } {     
 if { [HTTP::header is_keepalive] } {       
 HTTP::header replace "Connection" "Keep-Alive" 
 }     
 HTTP::version "1.0"   
 } 
 } 
 when HTTP_RESPONSE {   
 if { [HTTP::header Content-Type] starts_with "text/html" } {     
 if { [HTTP::header exists "Content-Length"] } {       
 log local0. "content length: [HTTP::header {Content-Length}]"       
 set content_length [HTTP::header "Content-Length"]     
 } else {       
 set content_length 1000000000     
 }     
 log local0. "Collecting $content_length bytes"     
 if { $content_length > 0 } {        
 HTTP::collect $content_length     
 }   
 } 
 } 
 when HTTP_RESPONSE_DATA {   
 log local0. "Content Type: [HTTP::header Content-Type]"   
 if { ! ([HTTP::payload] contains $::exist_search) } {     
 log local0. "Payload didn't contain $::exist_search!"     
 set idx [string last "" [HTTP::payload]]     
 if { -1 == $idx } {       
 set idx [string last "" [HTTP::payload]] 
 }     
 log local0. "html end tag found at $idx"     
 if { -1 == $idx } {       
 set offset [HTTP::payload length]     
 } else {      
 set offset $idx    
 }     
 HTTP::payload replace $offset 0 $::analytics   
 } 
 } 
 }}