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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;
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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
78
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 }