Java REST Client with Basic Authentication

This Java Client can be used to invoke any RESTful endpoint by proving a baseURL, username and password.

import org.apache.commons.codec.binary.Base64;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
public class RESTInvoker {
    private final String baseUrl;
    private final String username;
    private final String password;
    public RESTInvoker(String baseUrl, String username, String password) {
        this.baseUrl = baseUrl;
        this.username = username;
        this.password = password;
    }
    public String getRESTResponse(String accountId){
       getDataFromServer("account/" + accountId);
    }
    String getDataFromServer(String path) {
        StringBuilder sb = new StringBuilder();
        try {
            URL url = new URL(baseUrl + path);
            URLConnection urlConnection = setUsernamePassword(url);
            BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
            String line;
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
            reader.close();
            return sb.toString();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    private URLConnection setUsernamePassword(URL url) throws IOException {
        URLConnection urlConnection = url.openConnection();
        String authString = username + ":" + password;
        String authStringEnc = new String(Base64.encodeBase64(authString.getBytes()));
        urlConnection.setRequestProperty("Authorization", "Basic " + authStringEnc);
        return urlConnection;
    }
}