preemptive http basic authentication in apache http client library

BasicAuth.java

public class BasicAuth
{

public static void main(String a[])throws Exception
{
  System.out.println(getHttpResponse("78.101.139.84"));
}

public static String getHttpResponse(final String ip) throws IOException
	{
		String responseString = null;
		final HttpHost targetHost = new HttpHost("examplehost.com", 443, "https");
		final CredentialsProvider credsProvider = new BasicCredentialsProvider();
		credsProvider.setCredentials(AuthScope.ANY,
				new UsernamePasswordCredentials("username","password"));
		final AuthCache authCache = new BasicAuthCache();
		authCache.put(targetHost, new BasicScheme());

		// Add AuthCache to the execution context
		final HttpClientContext context = HttpClientContext.create();
		context.setCredentialsProvider(credsProvider);
		context.setAuthCache(authCache);

		RequestConfig.Builder requestBuilder = RequestConfig.custom();
		requestBuilder = requestBuilder.setAuthenticationEnabled(true);

		final CloseableHttpClient httpclient = HttpClients.custom().setDefaultRequestConfig(requestBuilder.build())
				.setDefaultCredentialsProvider(credsProvider).build();


		try
		{
			final HttpGet httpget = new HttpGet("url");
			
			System.out.println("Executing request " + httpget.getRequestLine());
			final CloseableHttpResponse resp = httpclient.execute(httpget, context);
			try
			{
				System.out.println("----------------------------------------");
				System.out.println(resp.getStatusLine());
				responseString = EntityUtils.toString(resp.getEntity());
				System.out.println("the response string is :" + responseString);
				EntityUtils.consume(resp.getEntity());
			}
			finally
			{
				resp.close();
			}
		}
		finally
		{
			httpclient.close();
		}
		return responseString;
	}
}

no use without package detail...

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpException;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScheme;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.AuthState;
import org.apache.http.auth.Credentials;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.AuthCache;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.protocol.ClientContext;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.impl.auth.BasicScheme;
import org.apache.http.impl.client.BasicAuthCache;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.ExecutionContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;

package detail listed above