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}