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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.protocol;
29  
30  import java.io.IOException;
31  import java.net.InetAddress;
32  
33  import org.apache.http.HttpConnection;
34  import org.apache.http.HttpException;
35  import org.apache.http.HttpHost;
36  import org.apache.http.HttpInetConnection;
37  import org.apache.http.HttpRequest;
38  import org.apache.http.HttpRequestInterceptor;
39  import org.apache.http.HttpVersion;
40  import org.apache.http.ProtocolException;
41  import org.apache.http.ProtocolVersion;
42  import org.apache.http.annotation.Immutable;
43  import org.apache.http.util.Args;
44  
45  /**
46   * RequestTargetHost is responsible for adding <code>Host</code> header. This
47   * interceptor is required for client side protocol processors.
48   *
49   * @since 4.0
50   */
51  @Immutable
52  public class RequestTargetHost implements HttpRequestInterceptor {
53  
54      public RequestTargetHost() {
55          super();
56      }
57  
58      @Override
59      public void process(final HttpRequest request, final HttpContext context)
60              throws HttpException, IOException {
61          Args.notNull(request, "HTTP request");
62  
63          final HttpCoreContext corecontext = HttpCoreContext.adapt(context);
64  
65          final ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
66          final String method = request.getRequestLine().getMethod();
67          if (method.equalsIgnoreCase("CONNECT") && ver.lessEquals(HttpVersion.HTTP_1_0)) {
68              return;
69          }
70  
71          if (!request.containsHeader(HTTP.TARGET_HOST)) {
72              HttpHost targethost = corecontext.getTargetHost();
73              if (targethost == null) {
74                  final HttpConnection conn = corecontext.getConnection();
75                  if (conn instanceof HttpInetConnection) {
76                      // Populate the context with a default HTTP host based on the
77                      // inet address of the target host
78                      final InetAddress address = ((HttpInetConnection) conn).getRemoteAddress();
79                      final int port = ((HttpInetConnection) conn).getRemotePort();
80                      if (address != null) {
81                          targethost = new HttpHost(address.getHostName(), port);
82                      }
83                  }
84                  if (targethost == null) {
85                      if (ver.lessEquals(HttpVersion.HTTP_1_0)) {
86                          return;
87                      } else {
88                          throw new ProtocolException("Target host missing");
89                      }
90                  }
91              }
92              request.addHeader(HTTP.TARGET_HOST, targethost.toHostString());
93          }
94      }
95  
96  }