Extending the CustRestConsumer class, the get method is public for invocation but the build URL and credentialing methods are both private, so as to prevent exposing that information. This is covered in detail in my blog post: http://edm00se.github.io/DevBlog/xpages/server-rest-with-authentication/

CustAuthRestConsumer.java

package com.eric.restful;

import java.net.URL;
import java.net.URLConnection;
import java.io.BufferedReader;
import org.apache.commons.codec.binary.Base64;
import com.google.gson.*;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.IOException;
import java.net.MalformedURLException;

/**
 * Class with a single, public, static method to provide a  REST consumer
 * which returns data as a JsonObject, with authentication.
 * 
 * @author Eric McCormick, @edm00se
 * 
 */
public class  MyDataConsumer {

	/**
	 * Modified copy of co.3edesign.eric.restful CustRestConsumer GetMyData
	 * method. This one requires provides basic authentication with Base64
	 * encoding.
	 * 
	 * @param myUrlStr URL of the REST endpoint
	 * @return JsonObject of the REST data
	 */
	public JsonObject GetMyAuthenticatedRestData( String myUrlStr ) {
		JsonObject myRestData = new JsonObject();
		try{
			URL myUrl = new URL(myUrlStr);
			URLConnection urlCon = myUrl.openConnection();
			urlCon.setRequestProperty("Method", "GET");
			urlCon.setRequestProperty("Accept", "application/json");
			urlCon.setConnectTimeout(5000);
			//set the basic auth of the hashed value of the user to connect
			urlCon.addRequestProperty("Authorization", GetMyCredentials() );
			InputStream is = urlCon.getInputStream();
			InputStreamReader isR = new InputStreamReader(is);
			BufferedReader reader = new BufferedReader(isR);
			StringBuffer buffer = new StringBuffer();
			String line = "";
			while( (line = reader.readLine()) != null ){
				buffer.append(line);
			}
			reader.close();
			JsonParser parser = new JsonParser();
			myRestData = (JsonObject) parser.parse(buffer.toString());
			
			return myRestData;
			
		}catch( MalformedURLException e ){
			e.printStackTrace();
			myRestData.addProperty("error", e.toString());
			return myRestData;
		}catch( IOException e ){
			e.printStackTrace();
			myRestData.addProperty("error", e.toString());
			return myRestData;
		}
	}
	
	/**
	 * Uses the Apache Commons codec binary Base64 package for encoding 
	 * of credentials, so none transmit 'in the open'.
	 * 
	 * @return String of credentials for use with authenticated REST source
	 */
	private String GetMyCredentials () {
		String rawUser = "SomeUsername";
		String rawPass = "SomePassword12345";
		String rawCred = rawUser+":"+rawPass;
		String myCred = Base64.encodeBase64String(rawCred.getBytes());
		return "Basic "+myCred;
	}
	
	/**
	 * @param some parameters from which you build your URL source
	 * @return String of the properly built URL of the source REST data
	 */
	private String BuildMyURL( String param ) {
		//the string this returns is 
		String base = "https://";
		String srv = "my.company.com";
		//String port = ":443";
		String pth = "/api/data/collections/name/ViewName";
		return base+srv+pth+"?"+param;
	}
}