Consider delaying (buffering) outgoing responses until request is complete in #273

Some Browsers consider a request failed when a response is sent before the entire request has gone out. We may want to look into delaying (buffering) outgoing responses until the complete request has been received.

Once #259 is in, this is less of an issue, because we default to buffering the whole incoming request first before invoking the request handler. However, this can still easily be reproduced by using the StreamingServer (see example 1).

This ticket exists for the reference, to document this behavior and as an RFC for future changes.