Doing https request with unknown certificate

WebClient.java

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.security.cert.X509Certificate;
import java.util.ArrayList;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

public class WebClient {
    private final String url;

    public WebClient(String url) {
        this.url = url;
    }


    public String postHttps() {
        String res = "";
        ArrayList<NameValuePair> params = new ArrayList<NameValuePair>();

        params.add(new BasicNameValuePair("usp_id", "usp number"));
        params.add(new BasicNameValuePair("password", "stoa password"));

        try {
            SSLContext ctx = SSLContext.getInstance("TLS");
            ctx.init(null, new TrustManager[]{
                    new X509TrustManager() {
                        public void checkClientTrusted(X509Certificate[] chain, String authType) {
                        }

                        public void checkServerTrusted(X509Certificate[] chain, String authType) {
                        }

                        public X509Certificate[] getAcceptedIssuers() {
                            return new X509Certificate[]{};
                        }
                    }
            }, null);

            HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {
                @Override
                public boolean verify(String hostname, SSLSession session) {
                    return true;
                }
            });

            HttpsURLConnection.setDefaultSSLSocketFactory(ctx.getSocketFactory());

            HttpClient client = new DefaultHttpClient();
            HttpPost request = new HttpPost(this.url);

            request.setEntity(new UrlEncodedFormEntity(params));
            HttpResponse response = client.execute(request);

            res = EntityUtils.toString(response.getEntity());

        } catch (Exception e) {
            e.printStackTrace();
        }

        return res;

    }
}