o) Add some more assertions to ProxyPipe around errors and cancelling. o) When ProxyClient cancels us before we've told it we're done or there's an    error we must cancel any outstanding actions.
o) Add some more assertions to ProxyPipe around errors and cancelling.
o) When ProxyClient cancels us before we've told it we're done or there's an
   error we must cancel any outstanding actions.


wanproxy/wanproxy,wanproxy/wanproxy,wanproxy/wanproxy