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28 package org.apache.http.protocol;
29
30 import java.io.IOException;
31
32 import org.apache.http.HttpEntity;
33 import org.apache.http.HttpEntityEnclosingRequest;
34 import org.apache.http.HttpException;
35 import org.apache.http.HttpRequest;
36 import org.apache.http.HttpRequestInterceptor;
37 import org.apache.http.HttpVersion;
38 import org.apache.http.ProtocolVersion;
39 import org.apache.http.annotation.ThreadingBehavior;
40 import org.apache.http.annotation.Contract;
41 import org.apache.http.params.CoreProtocolPNames;
42 import org.apache.http.util.Args;
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51 @Contract(threading = ThreadingBehavior.IMMUTABLE)
52 @SuppressWarnings("deprecation")
53 public class RequestExpectContinue implements HttpRequestInterceptor {
54
55 private final boolean activeByDefault;
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59
60 @Deprecated
61 public RequestExpectContinue() {
62 this(false);
63 }
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68 public RequestExpectContinue(final boolean activeByDefault) {
69 super();
70 this.activeByDefault = activeByDefault;
71 }
72
73 @Override
74 public void process(final HttpRequest request, final HttpContext context)
75 throws HttpException, IOException {
76 Args.notNull(request, "HTTP request");
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78 if (!request.containsHeader(HTTP.EXPECT_DIRECTIVE)) {
79 if (request instanceof HttpEntityEnclosingRequest) {
80 final ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
81 final HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity();
82
83 if (entity != null
84 && entity.getContentLength() != 0 && !ver.lessEquals(HttpVersion.HTTP_1_0)) {
85 final boolean active = request.getParams().getBooleanParameter(
86 CoreProtocolPNames.USE_EXPECT_CONTINUE, this.activeByDefault);
87 if (active) {
88 request.addHeader(HTTP.EXPECT_DIRECTIVE, HTTP.EXPECT_CONTINUE);
89 }
90 }
91 }
92 }
93 }
94
95 }