• MaxKeepAliveRequests now limits the number of times a
  slave connection gets reused.
• Client streams that lack the EOF flag get now forcefully
  closed with a RST_STREAM (NO_ERROR) when the request has been answered.
• Only when 'HttpProtocolOptions Unsafe' is configured, will
  control characters in response headers or trailers be forwarded to the
  client. Otherwise, in the default configuration, a request will eiher
  fail with status 500 or the stream will be reset by a RST_STREAM frame.