001/*
002 * ====================================================================
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *   http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing,
014 * software distributed under the License is distributed on an
015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
016 * KIND, either express or implied.  See the License for the
017 * specific language governing permissions and limitations
018 * under the License.
019 * ====================================================================
020 *
021 * This software consists of voluntary contributions made by many
022 * individuals on behalf of the Apache Software Foundation.  For more
023 * information on the Apache Software Foundation, please see
024 * <http://www.apache.org/>.
025 *
026 */
027
028package org.apache.http.impl.client;
029
030import java.util.Collection;
031
032import org.apache.http.HttpStatus;
033import org.apache.http.annotation.Contract;
034import org.apache.http.annotation.ThreadingBehavior;
035import org.apache.http.auth.AUTH;
036import org.apache.http.client.config.RequestConfig;
037
038/**
039 * Default {@link org.apache.http.client.AuthenticationStrategy} implementation
040 * for proxy host authentication.
041 *
042 * @since 4.2
043 */
044@Contract(threading = ThreadingBehavior.IMMUTABLE)
045public class TargetAuthenticationStrategy extends AuthenticationStrategyImpl {
046
047    public static final TargetAuthenticationStrategy INSTANCE = new TargetAuthenticationStrategy();
048
049    public TargetAuthenticationStrategy() {
050        super(HttpStatus.SC_UNAUTHORIZED, AUTH.WWW_AUTH);
051    }
052
053    @Override
054    Collection<String> getPreferredAuthSchemes(final RequestConfig config) {
055        return config.getTargetPreferredAuthSchemes();
056    }
057
058}