tomcat6: denial of service

When a response for a request with a request body is returned to the
user agent before the request body is fully read, by default Tomcat
swallows the remaining request body so that the next request on the
connection may be processed. There was no limit to the size of request
body that Tomcat would swallow. This permitted a limited Denial of
Service as Tomcat would never close the connection and a processing
thread would remain allocated to the connection.