apache jammed with lots of 408s

408 - Request Timeout
A 408 status code means that the client did not produce a request quickly enough. A server is set to only wait a certain amount of time for responses from clients, and a 408 status code indicates that time has passed

http://www.addedbytes.com/articles/http-status-codes-explained/

Solution:
ReadTimeOut 10 (default is 120 seconds)