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From Sagi Mann <sagim...@gmail.com>
Subject NoHttpResponseException second time around...
Date Mon, 13 Oct 2008 13:07:00 GMT

Hi all,
I have an issue trying to test a primitive proprietary http server with
HttpClient 3.1. I start the "server", accepting sockets on port 9090. I then
run the client command line, which sends a simple GET message to the server,
expecting a 200 status reply. All works well, the 200 reply arrives at the
client side, and the client app exits (but the server remains running and
listening).

I then re-run the client with the same cmdline. The server receives the
request, but on the client side, instead of a 200 reply, I get an exception
(see below). No exception is thrown on the server side at this point. I keep
re-running the client and get the same exception. If I restart the server,
and re-run the client - same thing: first time works fine, then the rest of
the times I get the exception again. Seems like the server can only handle
one request, before going crazy.

Can someone maybe help diagnose this?


The exception on the client side is:

Oct 13, 2008 2:37:11 PM org.apache.commons.httpclient.HttpMethodDirector
executeWithRetry
INFO: I/O exception (org.apache.commons.httpclient.NoHttpResponseException)
caught when processing request: The server host7 failed to respond
Oct 13, 2008 2:37:11 PM org.apache.commons.httpclient.HttpMethodDirector
executeWithRetry
INFO: Retrying request
Oct 13, 2008 2:37:11 PM org.apache.commons.httpclient.HttpMethodDirector
executeWithRetry
INFO: I/O exception (org.apache.commons.httpclient.NoHttpResponseException)
caught when processing request: The server host7 failed to respond
Oct 13, 2008 2:37:11 PM org.apache.commons.httpclient.HttpMethodDirector
executeWithRetry
INFO: Retrying request
Oct 13, 2008 2:37:11 PM org.apache.commons.httpclient.HttpMethodDirector
executeWithRetry
INFO: I/O exception (org.apache.commons.httpclient.NoHttpResponseException)
caught when processing request: The server host7 failed to respond
Oct 13, 2008 2:37:11 PM org.apache.commons.httpclient.HttpMethodDirector
executeWithRetry
INFO: Retrying request
org.apache.commons.httpclient.NoHttpResponseException: The server host7
failed to respond
        at
org.apache.commons.httpclient.HttpMethodBase.readStatusLine(HttpMethodBase.java:1835)
        at
org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase.java:1590)
        at
org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:995)
        at
org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:397)
        at
org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170)
        at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
        at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:324)
        at servletclient.Main.main(Main.java:72)


My client code is below, and I run it with the param:
http://host7:9090/ui?text=hello

            URL url = new URL(args[0]);
            HttpClient hc = new HttpClient();
            GetMethod method = new GetMethod(url.toURI().toString());
            try {
                int result = hc.executeMethod(method);
                String responseStr = method.getResponseBodyAsString();
                System.out.println("--- Incoming response
-------------------");
                System.out.println(responseStr);
                System.out.println("--- Total length: " +
responseStr.length() + " ----------------");
                System.out.println("result=" + result);
            } finally {
                method.releaseConnection();
            }


My server code is:

            try {
                ServerSocketChannel ssc = ServerSocketChannel.open();
                ssc.socket().bind(new InetSocketAddress(address, port));
                boolean b = true;
                while (b) {
                    SocketChannel ch = ssc.accept();
                    process(ch); // see process() below
                }
            } catch (ClosedByInterruptException ex) {
                System.out.println("Shutting down listener");
            } catch (Throwable ex) {
                ex.printStackTrace();
            }


process() code:

        public static void process(SocketChannel ch) {
            try {
                ch.configureBlocking(true);
                try {
                    ByteBuffer buf = ByteBuffer.allocate(4096);
                    StringBuffer sb = new StringBuffer();
                    ByteArrayOutputStream baos = new
ByteArrayOutputStream();
                    
                    int result, total = 0;
                    System.out.println("\n--- Incoming message
-------------------");
                    buf.clear();
                    while ((result = ch.read(buf)) > 0) {
                        total += result;
                        baos.write(buf.array(), 0, result);
                        buf.rewind();
                        if (result < buf.capacity()) break;
                    }
                    String s = new String(
                            baos.toByteArray(),
                            "ISO-8859-1");
                    System.out.print(s);
                    System.out.println  ("--- Read total " + total + " bytes
---------------");
                    ch.write(response); //see response value below
                    ch.finishConnect();
                } finally {
                    ch.close();
                }
            } catch (Throwable ex) {
                ex.printStackTrace();
            }
        }


        static ByteBuffer response;
        
        static {
            String responseStr =
                    "HTTP/1.1 200 OK\r\n" +
                    "X-Powered-By: Servlet/2.5\r\n" +
                    "Content-Type: text/html;charset=ISO-8859-1\r\n" +
                    "Content-Length: 0\r\n" +
                    "Date: " + new Date() + "\r\n" +
                    "Server: mysrv\r\n" +
                    "Connection: close\r\n\r\n";
            try {
                response =
ByteBuffer.wrap(responseStr.getBytes("ISO-8859-1"));
            } catch (Throwable ex) {
                ex.printStackTrace();
            }
        }

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