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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.hc.core5.http.protocol;
29  
30  import java.io.IOException;
31  
32  import org.apache.hc.core5.annotation.Contract;
33  import org.apache.hc.core5.annotation.ThreadingBehavior;
34  import org.apache.hc.core5.http.EntityDetails;
35  import org.apache.hc.core5.http.HttpException;
36  import org.apache.hc.core5.http.HttpHeaders;
37  import org.apache.hc.core5.http.HttpRequest;
38  import org.apache.hc.core5.http.HttpRequestInterceptor;
39  import org.apache.hc.core5.http.HttpVersion;
40  import org.apache.hc.core5.http.ProtocolException;
41  import org.apache.hc.core5.http.ProtocolVersion;
42  import org.apache.hc.core5.net.URIAuthority;
43  import org.apache.hc.core5.util.Args;
44  
45  /**
46   * RequestHostOutgoing is responsible for adding {@code Host} header to the outgoing message.
47   * This interceptor is required for client side protocol processors.
48   *
49   * @since 4.0
50   */
51  @Contract(threading = ThreadingBehavior.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 EntityDetails entity, final HttpContext context)
60              throws HttpException, IOException {
61          Args.notNull(request, "HTTP request");
62          Args.notNull(context, "HTTP context");
63  
64          final ProtocolVersion ver = context.getProtocolVersion();
65          final String method = request.getMethod();
66          if (method.equalsIgnoreCase("CONNECT") && ver.lessEquals(HttpVersion.HTTP_1_0)) {
67              return;
68          }
69  
70          if (!request.containsHeader(HttpHeaders.HOST)) {
71              URIAuthority authority = request.getAuthority();
72              if (authority == null) {
73                  if (ver.lessEquals(HttpVersion.HTTP_1_0)) {
74                      return;
75                  }
76                  throw new ProtocolException("Target host is unknown");
77              }
78              if (authority.getUserInfo() != null) {
79                  authority = new URIAuthority(authority.getHostName(), authority.getPort());
80              }
81              request.addHeader(HttpHeaders.HOST, authority);
82          }
83      }
84  
85  }