Eclipse Outbound connection blocked : The same url works from web browser

Question

I am using the HttpURLConnection class to connect to external web service from eclipse, then I am getting a error message "Connection Refused"

public class TestConnection {


    static {
        //for localhost testing only
        javax.net.ssl.HttpsURLConnection.setDefaultHostnameVerifier(
            new javax.net.ssl.HostnameVerifier(){

                    public boolean verify(String hostname,
                                      javax.net.ssl.SSLSession sslSession) {
                        if (hostname.equals("localhost")) {
                            return true;
                        }
                        return false;
                    }
                });
    }

    public static void main(String[] args)
    {




    HttpURLConnection urlConnection;
    try {
        //https get method with required parameters
    //  XMLHttpRequest s1 = new XMLHttpRequest ();
        urlConnection = (HttpURLConnection) ((new URL("https://google.com").openConnection()));
        urlConnection.setRequestMethod("GET");
        urlConnection.setRequestProperty("User-Agent", "");
        int HTTPS_RESPONSE_CODE = urlConnection.getResponseCode();

        BufferedReader in = new BufferedReader(
                new InputStreamReader(urlConnection.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
        String HTTPS_RESULT=response.toString(); 
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    }

}

java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.connect(Unknown Source)
    at sun.security.ssl.BaseSSLSocketImpl.connect(Unknown Source)
    at sun.net.NetworkClient.doConnect(Unknown Source)
    at sun.net.www.http.HttpClient.openServer(Unknown Source)
    at sun.net.www.http.HttpClient.openServer(Unknown Source)
    at sun.net.www.protocol.https.HttpsClient.<init>(Unknown Source)
    at sun.net.www.protocol.https.HttpsClient.New(Unknown Source)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    at java.net.HttpURLConnection.getResponseCode(Unknown Source)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(Unknown Source)
    at TestConnection.main(TestConnection.java:19)

But If i try to connect to the same site from a browser I am able to get a response from the service. Can you please let me know if there is a work around?

possible duplicate of [java.net.ConnectException: Connection refused](http://stackoverflow.com/questions/6876266/java-net-connectexception-connection-refused) — karan, Aug 03 '15 at 05:12
What URL are you trying to access? Please post it in your OP. — Tim Biegeleisen, Aug 03 '15 at 05:41
This code runs completely fine on my local setup. I am using IntelliJ, though this should not matter. Are you sure you are running this exact code? — Tim Biegeleisen, Aug 03 '15 at 05:51
Yes I have posted exactly the same code, I am behind a firewall? Could this be a issue? — Prashanna Narayanasamy, Aug 03 '15 at 06:06
If you were behind a Firewall, I would expect the call from the browser to also fail. — Tim Biegeleisen, Aug 03 '15 at 06:20
Try using `HttpsURLConnection` instead of `HttpURLConnection`, and let me know what happens. — Tim Biegeleisen, Aug 03 '15 at 06:27
Tried Https Tim, Same error. I am just breaking my head now. I am able to access all the sites via a browser but not via the httpurlconnection — Prashanna Narayanasamy, Aug 03 '15 at 06:50
I get the definite feeling that Eclipse is stale and needs to be refreshed. Again, this code runs fine from my local IDE. — Tim Biegeleisen, Aug 03 '15 at 07:14
We think it's a proxy issue. I will test tomorrow again and keep you posted. Thanks Tim. — Prashanna Narayanasamy, Aug 03 '15 at 10:18

score 0 · Answer 1 · answered Aug 03 '15 at 05:15

0

By default, the HttpURLConnection class will not allow localhost as the hostname. You need to define a custom hostname verifier which will allow localhost. You can place this code into a static block at the top of the class where you intend to use HttpURLConnection:

public final class YourClassName {
    static {
        //for localhost testing only
        javax.net.ssl.HttpsURLConnection.setDefaultHostnameVerifier(
            new javax.net.ssl.HostnameVerifier(){

                    public boolean verify(String hostname,
                                      javax.net.ssl.SSLSession sslSession) {
                        if (hostname.equals("localhost")) {
                            return true;
                        }
                        return false;
                    }
                });
    }

    // use HttpURLConnection here ...
}

answered Aug 03 '15 at 05:15

Tim Biegeleisen

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Still I am having the same issue. – Prashanna Narayanasamy Aug 03 '15 at 05:40
Try refreshing your workspace. This should resolve your problem. – Tim Biegeleisen Aug 03 '15 at 05:40
I tried refreshing the workspace, I have added the the complete code in the question, Can you please have a look at it? – Prashanna Narayanasamy Aug 03 '15 at 05:44
Hello Tom, added proxy settings to httpurlconnection and it worked finally – Prashanna Narayanasamy Aug 04 '15 at 10:27
Please post an amswer to your question. I have never seen this proxy problem before. – Tim Biegeleisen Aug 04 '15 at 11:24

score 0 · Answer 2 · answered Aug 04 '15 at 11:31

Please find the working code,

PROXY_SERVER set to a valid proxy server and port for http I am using is 8080

proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(PROXY_SERVER, PROXY_PORT));

And when you establish the connection pass the proxy as an argument.

urlConnection = (HttpURLConnection) ((new URL(URI).openConnection(proxy)));

Eclipse Outbound connection blocked : The same url works from web browser

2 Answers2

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