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 org.apache.http.annotation.Contract;
031import org.apache.http.annotation.ThreadingBehavior;
032import org.apache.http.client.methods.HttpDelete;
033import org.apache.http.client.methods.HttpGet;
034import org.apache.http.client.methods.HttpHead;
035import org.apache.http.client.methods.HttpPost;
036
037/**
038 * Lax {@link org.apache.http.client.RedirectStrategy} implementation
039 * that automatically redirects all HEAD, GET, POST, and DELETE requests.
040 * This strategy relaxes restrictions on automatic redirection of
041 * POST methods imposed by the HTTP specification.
042 *
043 * @since 4.2
044 */
045@Contract(threading = ThreadingBehavior.IMMUTABLE)
046public class LaxRedirectStrategy extends DefaultRedirectStrategy {
047
048    public static final LaxRedirectStrategy INSTANCE = new LaxRedirectStrategy();
049
050    /**
051     * Redirectable methods.
052     */
053    private static final String[] REDIRECT_METHODS = new String[] {
054        HttpGet.METHOD_NAME,
055        HttpPost.METHOD_NAME,
056        HttpHead.METHOD_NAME,
057        HttpDelete.METHOD_NAME
058    };
059
060    @Override
061    protected boolean isRedirectable(final String method) {
062        for (final String m: REDIRECT_METHODS) {
063            if (m.equalsIgnoreCase(method)) {
064                return true;
065            }
066        }
067        return false;
068    }
069
070}