This version contains:
 * new timeout to remember connections after they are finished to be able
 to report termination on this connection to upload progress probes

 * handling of HTTP error 413 (request entity too large)

Addition of a header filter to track HTTP errors and return
the right status to upload progress probes.

This timer help us track finished connections and still report the status to progress probe.

* Added header filter to track 413 errors (not working atm)

 * First version