code: public static CompletableFuture<Void> sendResponse(
  			@Nonnull ChannelHandlerContext channelHandlerContext,
  			@Nonnull HttpRequest httpRequest,
  			@Nonnull String message,
  			@Nonnull HttpResponseStatus statusCode,
  			@Nonnull Map<String, String> headers) {
  
  		return sendResponse(
  			channelHandlerContext,
  			HttpHeaders.isKeepAlive(httpRequest),
  			message,
  			statusCode,
  			headers);
  	}
docs: Sends the given response and status code to the given channel.
  
  @param channelHandlerContext identifying the open channel
  @param httpRequest originating http request
  @param message which should be sent
  @param statusCode of the message to send
  @param headers additional header values