Java tutorial
//package com.java2s; /** * Copyright (c) 2015, 2016 IBM Corporation. All rights reserved. * <p/> * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.net.HttpURLConnection; import java.util.List; import java.util.Map; public class Main { /** * Name of the header sent by the server in a response to indicate a basic authentication challenge. */ final static String AUTHENTICATION_CHALLENGE_HEADER = "WWW-Authenticate"; /** * Determine whether the response contains a basic authentication challenge. * @param connection the connection from which the response is extracted. * @return <code>true</code> if the response contains an authentication challenge, <code>false</code> otherwise. */ static boolean hasAuthenticationChallenge(HttpURLConnection connection) { Map<String, List<String>> headers = connection.getHeaderFields(); return headers.get(AUTHENTICATION_CHALLENGE_HEADER) != null; } }