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79 lines
3.1 KiB
Java
79 lines
3.1 KiB
Java
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package ch.boye.httpclientandroidlib.protocol;
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import java.io.IOException;
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import ch.boye.httpclientandroidlib.HttpEntity;
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import ch.boye.httpclientandroidlib.HttpEntityEnclosingRequest;
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import ch.boye.httpclientandroidlib.HttpException;
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import ch.boye.httpclientandroidlib.HttpRequest;
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import ch.boye.httpclientandroidlib.HttpRequestInterceptor;
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import ch.boye.httpclientandroidlib.HttpVersion;
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import ch.boye.httpclientandroidlib.ProtocolVersion;
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import ch.boye.httpclientandroidlib.params.HttpProtocolParams;
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/**
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* RequestExpectContinue is responsible for enabling the 'expect-continue'
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* handshake by adding <code>Expect</code> header. This interceptor is
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* recommended for client side protocol processors.
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* <p>
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* The following parameters can be used to customize the behavior of this
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* class:
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* <ul>
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* <li>{@link ch.boye.httpclientandroidlib.params.CoreProtocolPNames#USE_EXPECT_CONTINUE}</li>
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* </ul>
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*
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* @since 4.0
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*/
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public class RequestExpectContinue implements HttpRequestInterceptor {
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public RequestExpectContinue() {
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super();
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}
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public void process(final HttpRequest request, final HttpContext context)
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throws HttpException, IOException {
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if (request == null) {
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throw new IllegalArgumentException("HTTP request may not be null");
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}
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if (request instanceof HttpEntityEnclosingRequest) {
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HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity();
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// Do not send the expect header if request body is known to be empty
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if (entity != null && entity.getContentLength() != 0) {
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ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
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if (HttpProtocolParams.useExpectContinue(request.getParams())
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&& !ver.lessEquals(HttpVersion.HTTP_1_0)) {
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request.addHeader(HTTP.EXPECT_DIRECTIVE, HTTP.EXPECT_CONTINUE);
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}
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}
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}
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}
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}
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