Fix 'early response' issue #1
Description
The following warning occasionally appears in logs:
[warn] a.a.ActorSystemImpl - Sending an 2xx 'early' response before end of request was received... Note that the connection will be closed after this response. Also, many clients will not read early responses! Consider only issuing this response after the request data has been completely read!
This seems to be caused by uploading workspace dumps. It also does not appear to cause any problems with either the server or the client. Nevertheless, we should track down what exactly causes this problem and fix it to stop a useless warning from polluting the logs.