HttpServletRequest InputStream read return -1

Question

I am trying to read a request InputStream but the end of the stream has been reached.

The only class (servlet) is:

    public class TestServlet extends HttpServlet
    {
        protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
        {
            InputStream clientIn = request.getInputStream();
            OutputStream clientOut = response.getOutputStream();
            byte[] buffer = new byte[4096];
            int n;
            try
            {
                while ((n = clientIn.read(buffer)) != -1)    // --------->  Here, n is -1
                {
                    System.out.println(new String(buffer,0,n));
                    clientOut.write(("Ok = " + n).getBytes());
                }
            }
            catch (Exception e)
            {
                System.err.println(e);
            }
        }
    }

there is no any other classes (such as filter, listener or other servlet)

and the client code is:

public class Main
    {
        public static void main(String[] args) throws IOException, InterruptedException
        {   
            String postCommand = "POST / HTTP/1.1\r\n" +
                    "Host: localhost\r\n" +
                    "Content-Type: binary/octet-stream\r\n" +
                    "Connection: keep-alive\r\n\r\n" +
                    "name1=value1&name2=value2";

            Socket socket = new Socket("localhost", 8080);
            InputStream serverIn = socket.getInputStream();
            OutputStream serverOut = socket.getOutputStream();
            serverOut.write(postCommand.getBytes());
            int n = 0, count = 1;
            byte[] buffer = new byte[4096];
            do
            {
                if (n != 0)
                    System.out.println(new String(buffer, 0, n));
                serverOut.write(("foo " + count).getBytes());
            } while ((n = serverIn.read(buffer)) != -1 && count++

Thank you in advance. Kind regards!

Answer 1

Your client isn't sending valid HTTP 1.1. There is no content-length header and therefore no way for the Servlet to know when to stop reading. There is no actual end of stream because an HTTP client must keep the connection open to read the response.

Use an HttpURLConnection.