01: /*
02: * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpcore/tags/4.0-beta1/module-main/src/main/java/org/apache/http/protocol/RequestExpectContinue.java $
03: * $Revision: 573864 $
04: * $Date: 2007-09-08 17:53:25 +0200 (Sat, 08 Sep 2007) $
05: *
06: * ====================================================================
07: * Licensed to the Apache Software Foundation (ASF) under one
08: * or more contributor license agreements. See the NOTICE file
09: * distributed with this work for additional information
10: * regarding copyright ownership. The ASF licenses this file
11: * to you under the Apache License, Version 2.0 (the
12: * "License"); you may not use this file except in compliance
13: * with the License. You may obtain a copy of the License at
14: *
15: * http://www.apache.org/licenses/LICENSE-2.0
16: *
17: * Unless required by applicable law or agreed to in writing,
18: * software distributed under the License is distributed on an
19: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
20: * KIND, either express or implied. See the License for the
21: * specific language governing permissions and limitations
22: * under the License.
23: * ====================================================================
24: *
25: * This software consists of voluntary contributions made by many
26: * individuals on behalf of the Apache Software Foundation. For more
27: * information on the Apache Software Foundation, please see
28: * <http://www.apache.org/>.
29: *
30: */
31:
32: package org.apache.http.protocol;
33:
34: import java.io.IOException;
35:
36: import org.apache.http.HttpEntity;
37: import org.apache.http.HttpEntityEnclosingRequest;
38: import org.apache.http.HttpException;
39: import org.apache.http.HttpRequest;
40: import org.apache.http.HttpRequestInterceptor;
41: import org.apache.http.HttpVersion;
42: import org.apache.http.ProtocolVersion;
43: import org.apache.http.params.HttpProtocolParams;
44:
45: /**
46: * A request interceptor that enables the expect-continue handshake.
47: *
48: * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
49: *
50: * @version $Revision: 573864 $
51: *
52: * @since 4.0
53: */
54: public class RequestExpectContinue implements HttpRequestInterceptor {
55:
56: public RequestExpectContinue() {
57: super ();
58: }
59:
60: public void process(final HttpRequest request,
61: final HttpContext context) throws HttpException,
62: IOException {
63: if (request == null) {
64: throw new IllegalArgumentException(
65: "HTTP request may not be null");
66: }
67: if (request instanceof HttpEntityEnclosingRequest) {
68: HttpEntity entity = ((HttpEntityEnclosingRequest) request)
69: .getEntity();
70: // Do not send the expect header if request body is known to be empty
71: if (entity != null && entity.getContentLength() != 0) {
72: ProtocolVersion ver = request.getRequestLine()
73: .getProtocolVersion();
74: if (HttpProtocolParams.useExpectContinue(request
75: .getParams())
76: && !ver.lessEquals(HttpVersion.HTTP_1_0)) {
77: request.addHeader(HTTP.EXPECT_DIRECTIVE,
78: HTTP.EXPECT_CONTINUE);
79: }
80: }
81: }
82: }
83:
84: }
|