404 redirect based on URI

You'll want to store the URI in a session varaible and then access it in the response. I'm not sure what you were getting at with the comparison in the HTTP_REQUEST event without an if around it...

Something like this should work for you

when HTTP_REQUEST {
  set the_uri [HTTP::uri]
}
when HTTP_RESPONSE {
  if { ([HTTP::status] equals "404") && ($the_uri equals "/folder/folder2") } {
    HTTP::redirect "http://www.mysite.com"
  }
}

-Joe