16.8 Processing Timer C

   If timer C should fire, the proxy MUST either reset the timer with
   any value it chooses, or terminate the client transaction.  If the
   client transaction has received a provisional response, the proxy
   MUST generate a CANCEL request matching that transaction.  If the
   client transaction has not received a provisional response, the proxy
   MUST behave as if the transaction received a 408 (Request Timeout)
   response.
   Allowing the proxy to reset the timer allows the proxy to dynamically
   extend the transaction's lifetime based on current conditions (such
   as utilization) when the timer fires.

16.9 Handling Transport Errors

   If the transport layer notifies a proxy of an error when it tries to
   forward a request (see Section 18.4), the proxy MUST behave as if the
   forwarded request received a 503 (Service Unavailable) response.

   If the proxy is notified of an error when forwarding a response, it
   drops the response.  The proxy SHOULD NOT cancel any outstanding
   client transactions associated with this response context due to this
   notification.

      If a proxy cancels its outstanding client transactions, a single
      malicious or misbehaving client can cause all transactions to fail
      through its Via header field.

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