Feature: Do not pause connection stream to detect closed connections immediately.
(#315 by @clue)

Feature: Keep incoming Transfer-Encoding: chunked request header.
(#316 by @clue)

Feature: Reject invalid requests that contain both Content-Length and Transfer-Encoding request headers.
(#318 by @clue)

Minor internal refactoring to simplify connection close logic after sending response.
(#317 by @clue)