Apache request failed: error reading the headers

Issue

• Seeing the following errors in the apache error log:

  [error] [client 192.168.1.100] request failed: error reading the headers, referer: http://<host>/index.jsp?foo=bar
  

• Apache waits a time equal to the Timeout directive (defaults to 5 minutes if not defined) for a response from the client. It is likely Apache is waiting for the CRLF that indicates the end of the headers, yet it is never received.