iRule creation for a client detection - Need help

Hi all, I'm trying to write another iRule. I need the irule to detect if the method is a POST over HTTP 1.0 and the content-length is 1 million bytes or more. Here is the iRule that I wrote hoping that it covers the requirements.

when HTTP_REQUEST {

   if {([HTTP::method] equals "POST") and ([HTTP::version] equals "1.0") and ([HTTP::header "Content-Length"] >999999)}
         {
            log local0. "Client detection."
            reject
          }
      }

Thanks!!