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.ThreadingBehavior;
43 import org.apache.http.annotation.Contract;
44 import org.apache.http.util.Args;
45
46 /**
47 * RequestTargetHost is responsible for adding {@code Host} header. This
48 * interceptor is required for client side protocol processors.
49 *
50 * @since 4.0
51 */
52 @Contract(threading = ThreadingBehavior.IMMUTABLE)
53 public class RequestTargetHost implements HttpRequestInterceptor {
54
55 public RequestTargetHost() {
56 super();
57 }
58
59 @Override
60 public void process(final HttpRequest request, final HttpContext context)
61 throws HttpException, IOException {
62 Args.notNull(request, "HTTP request");
63
64 final HttpCoreContext coreContext = HttpCoreContext.adapt(context);
65
66 final ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
67 final String method = request.getRequestLine().getMethod();
68 if (method.equalsIgnoreCase("CONNECT") && ver.lessEquals(HttpVersion.HTTP_1_0)) {
69 return;
70 }
71
72 if (!request.containsHeader(HTTP.TARGET_HOST)) {
73 HttpHost targetHost = coreContext.getTargetHost();
74 if (targetHost == null) {
75 final HttpConnection conn = coreContext.getConnection();
76 if (conn instanceof HttpInetConnection) {
77 // Populate the context with a default HTTP host based on the
78 // inet address of the target host
79 final InetAddress address = ((HttpInetConnection) conn).getRemoteAddress();
80 final int port = ((HttpInetConnection) conn).getRemotePort();
81 if (address != null) {
82 targetHost = new HttpHost(address.getHostName(), port);
83 }
84 }
85 if (targetHost == null) {
86 if (ver.lessEquals(HttpVersion.HTTP_1_0)) {
87 return;
88 }
89 throw new ProtocolException("Target host missing");
90 }
91 }
92 request.addHeader(HTTP.TARGET_HOST, targetHost.toHostString());
93 }
94 }
95
96 }
97