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28 package org.apache.hc.client5.http.protocol;
29
30 import java.io.IOException;
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32 import org.apache.hc.client5.http.config.RequestConfig;
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.HeaderElements;
37 import org.apache.hc.core5.http.HttpException;
38 import org.apache.hc.core5.http.HttpHeaders;
39 import org.apache.hc.core5.http.HttpRequest;
40 import org.apache.hc.core5.http.HttpRequestInterceptor;
41 import org.apache.hc.core5.http.HttpVersion;
42 import org.apache.hc.core5.http.ProtocolVersion;
43 import org.apache.hc.core5.http.protocol.HttpContext;
44 import org.apache.hc.core5.util.Args;
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56 @Contract(threading = ThreadingBehavior.STATELESS)
57 public class RequestExpectContinue implements HttpRequestInterceptor {
58
59 public RequestExpectContinue() {
60 super();
61 }
62
63 @Override
64 public void process(final HttpRequest request, final EntityDetails entity, final HttpContext context)
65 throws HttpException, IOException {
66 Args.notNull(request, "HTTP request");
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68 if (!request.containsHeader(HttpHeaders.EXPECT)) {
69 final HttpClientContext clientContext = HttpClientContext.cast(context);
70 final ProtocolVersion version = request.getVersion() != null ? request.getVersion() : clientContext.getProtocolVersion();
71
72 if (entity != null
73 && entity.getContentLength() != 0 && !version.lessEquals(HttpVersion.HTTP_1_0)) {
74 final RequestConfig config = clientContext.getRequestConfigOrDefault();
75 if (config.isExpectContinueEnabled()) {
76 request.addHeader(HttpHeaders.EXPECT, HeaderElements.CONTINUE);
77 }
78 }
79 }
80 }
81
82 }