http/response.go
func ResponseWriter(response tchannel.ArgWritable) (http.ResponseWriter, func() error) {
	responseWriter := newTChanResponseWriter(response)
	return responseWriter, responseWriter.finish
}
func ResponseWriter(response tchannel.ArgWritable) (http.ResponseWriter, func() error) {
	responseWriter := newTChanResponseWriter(response)
	return responseWriter, responseWriter.finish
}
// ResponseWriter returns a http.ResponseWriter that will write to an underlying writer.
// It also returns a function that should be called once the handler has completed.