URL Connection Test

URLTest.java

import javax.net.ssl.*;
import java.io.IOException;
import java.net.*;
import java.security.cert.X509Certificate;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public class URLTest {

    public static void main(String[] args) {

        try {

            // Create a trust manager that does not validate certificate chains
            TrustManager[] trustAllCerts = new TrustManager[] {new X509TrustManager() {
                public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                    return null;
                }
                public void checkClientTrusted(X509Certificate[] certs, String authType) {
                }
                public void checkServerTrusted(X509Certificate[] certs, String authType) {
                }
            }
            };

            // Install the all-trusting trust manager
            SSLContext sc = null;
            try {
                sc = SSLContext.getInstance("SSL");
                sc.init(null, trustAllCerts, new java.security.SecureRandom());
            } catch(Exception e) {
                System.err.println("exception while initializing SSLContext");
                e.printStackTrace();
            }

            HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());

            // Create all-trusting host name verifier
            HostnameVerifier allHostsValid = new HostnameVerifier() {
                public boolean verify(String hostname, SSLSession session) {
                    return true;
                }
            };

            // Install the all-trusting host verifier
            HttpsURLConnection.setDefaultHostnameVerifier(allHostsValid);

            URL url = new URL(args[0]);
            Proxy proxy = getProxy(args[0]);
            System.out.println(proxy.toString());
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(proxy);

            StringBuilder builder = new StringBuilder();
            builder.append(httpURLConnection.getResponseCode())
                    .append(" ")
                    .append(httpURLConnection.getResponseMessage())
                    .append("\n");

            Map<String, List<String>> map = httpURLConnection.getHeaderFields();
            for (Map.Entry<String, List<String>> entry : map.entrySet())
            {
                if (entry.getKey() == null)
                    continue;
                builder.append( entry.getKey())
                        .append(": ");

                List<String> headerValues = entry.getValue();
                Iterator<String> it = headerValues.iterator();
                if (it.hasNext()) {
                    builder.append(it.next());

                    while (it.hasNext()) {
                        builder.append(", ")
                                .append(it.next());
                    }
                }

                builder.append("\n");
            }

            System.out.println(builder);

        } catch (IOException e) {
            System.err.println("Error creating HTTP connection");
            e.printStackTrace();
        }
    }

    private static Proxy getProxy(String url) {
        List<Proxy> l = null;
        try {
            ProxySelector def = ProxySelector.getDefault();

            l = def.select(new URI(url));
            ProxySelector.setDefault(null);
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (l != null) {
            for (Iterator<Proxy> iter = l.iterator(); iter.hasNext();) {
                java.net.Proxy proxy = iter.next();
                return proxy;
            }
        }
        return null;
    }
}