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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.Method;
41 import org.apache.hc.core5.http.ProtocolException;
42 import org.apache.hc.core5.http.ProtocolVersion;
43 import org.apache.hc.core5.net.URIAuthority;
44 import org.apache.hc.core5.util.Args;
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52 @Contract(threading = ThreadingBehavior.IMMUTABLE)
53 public class RequestTargetHost implements HttpRequestInterceptor {
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59 public static final HttpRequestInterceptor INSTANCE = new RequestTargetHost();
60
61 public RequestTargetHost() {
62 super();
63 }
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65 @Override
66 public void process(final HttpRequest request, final EntityDetails entity, final HttpContext context)
67 throws HttpException, IOException {
68 Args.notNull(request, "HTTP request");
69 Args.notNull(context, "HTTP context");
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71 final ProtocolVersion ver = context.getProtocolVersion();
72 final String method = request.getMethod();
73 if (Method.CONNECT.isSame(method) && ver.lessEquals(HttpVersion.HTTP_1_0)) {
74 return;
75 }
76
77 if (!request.containsHeader(HttpHeaders.HOST)) {
78 URIAuthority authority = request.getAuthority();
79 if (authority == null) {
80 if (ver.lessEquals(HttpVersion.HTTP_1_0)) {
81 return;
82 }
83 throw new ProtocolException("Target host is unknown");
84 }
85 if (authority.getUserInfo() != null) {
86 authority = new URIAuthority(authority.getHostName(), authority.getPort());
87 }
88 request.addHeader(HttpHeaders.HOST, authority);
89 }
90 }
91
92 }