interestingly, sending Connection:close changes www.google.com response from chunked to simple length-less respose+close. however due to https://github.com/tessel/runtime/issues/336 that means we cannot know the response is finished from desktop. stop sending header for now
proper mode switch for trailers (emitted after headersComplete, but before messageComplete)
trailer handling for server
basic error forwarding from IncomingMessage
lua_http_parser never actually called onError, implement error handling…