private void processHead(ChannelHandlerContext context, FullHttpRequest request) { HttpHeaders headers = request.headers(); FullHttpResponse response = null; if (headers.contains(Names.CONTENT_LENGTH)) { try { File file = getRequestedFile(request.getUri()); response = new DefaultFullHttpResponse( HTTP_1_1, request.getDecoderResult().isSuccess() ? OK : BAD_REQUEST); HttpHeaders.setContentLength(response, file.length()); } catch (FileNotFoundException | URISyntaxException e) { response = getBadRequest(e.getMessage()); } } context.writeAndFlush(response); }