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28 package org.apache.hc.client5.http.protocol;
29
30 import java.io.IOException;
31 import java.util.Collection;
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33 import org.apache.hc.core5.annotation.Contract;
34 import org.apache.hc.core5.annotation.ThreadingBehavior;
35 import org.apache.hc.core5.http.EntityDetails;
36 import org.apache.hc.core5.http.Header;
37 import org.apache.hc.core5.http.HttpException;
38 import org.apache.hc.core5.http.HttpRequest;
39 import org.apache.hc.core5.http.HttpRequestInterceptor;
40 import org.apache.hc.core5.http.Method;
41 import org.apache.hc.core5.http.protocol.HttpContext;
42 import org.apache.hc.core5.util.Args;
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49 @Contract(threading = ThreadingBehavior.STATELESS)
50 public class RequestDefaultHeaders implements HttpRequestInterceptor {
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57 public static final RequestDefaultHeaders INSTANCE = new RequestDefaultHeaders();
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59 private final Collection<? extends Header> defaultHeaders;
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64 public RequestDefaultHeaders(final Collection<? extends Header> defaultHeaders) {
65 super();
66 this.defaultHeaders = defaultHeaders;
67 }
68
69 public RequestDefaultHeaders() {
70 this(null);
71 }
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73 @Override
74 public void process(final HttpRequest request, final EntityDetails entity, final HttpContext context)
75 throws HttpException, IOException {
76 Args.notNull(request, "HTTP request");
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78 final String method = request.getMethod();
79 if (Method.CONNECT.isSame(method)) {
80 return;
81 }
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83 if (this.defaultHeaders != null) {
84 for (final Header defHeader : this.defaultHeaders) {
85 if(!request.containsHeader(defHeader.getName())) {
86 request.addHeader(defHeader);
87 }
88 }
89 }
90 }
91
92 }