java difference between BufferedReader and InputStream when using socket

Question

        try (
                InputStream reader = socket.getInputStream();
                OutputStream writer = socket.getOutputStream()
        ) {
            byte[] bytes = new byte[4096];
            int byteLength = reader.read(bytes);
            String message = new String(bytes, 0, byteLength, StandardCharsets.UTF_8);

            writer.write("response message".getBytes());
            writer.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }

        try (
                BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                OutputStream writer = socket.getOutputStream()
        ) {
            String message = reader.readLine();

            writer.write("response message".getBytes());
            writer.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }

I made server socket. It returns response message when it receives message from client socket. When I use only InputStream (first code), the client socket gets response message. However when I use BufferedReader (second code), the client socket cannot get response message.

The way I send response message is same. How I receive message is the only different.

What's wrong with the second code? What's the difference between them?