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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  
28  package org.apache.http.impl.client;
29  
30  import org.apache.http.annotation.Contract;
31  import org.apache.http.annotation.ThreadingBehavior;
32  import org.apache.http.client.methods.HttpDelete;
33  import org.apache.http.client.methods.HttpGet;
34  import org.apache.http.client.methods.HttpHead;
35  import org.apache.http.client.methods.HttpPost;
36  
37  /**
38   * Lax {@link org.apache.http.client.RedirectStrategy} implementation
39   * that automatically redirects all HEAD, GET, POST, and DELETE requests.
40   * This strategy relaxes restrictions on automatic redirection of
41   * POST methods imposed by the HTTP specification.
42   *
43   * @since 4.2
44   */
45  @Contract(threading = ThreadingBehavior.IMMUTABLE)
46  public class LaxRedirectStrategy extends DefaultRedirectStrategy {
47  
48      public static final LaxRedirectStrategy INSTANCE = new LaxRedirectStrategy();
49  
50      /**
51       * Redirectable methods.
52       */
53      private static final String[] REDIRECT_METHODS = new String[] {
54          HttpGet.METHOD_NAME,
55          HttpPost.METHOD_NAME,
56          HttpHead.METHOD_NAME,
57          HttpDelete.METHOD_NAME
58      };
59  
60      @Override
61      protected boolean isRedirectable(final String method) {
62          for (final String m: REDIRECT_METHODS) {
63              if (m.equalsIgnoreCase(method)) {
64                  return true;
65              }
66          }
67          return false;
68      }
69  
70  }