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83 lines
3.2 KiB
83 lines
3.2 KiB
/*
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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 org.apache.http.client.protocol;
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import java.io.IOException;
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import org.apache.http.HttpEntity;
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import org.apache.http.HttpEntityEnclosingRequest;
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import org.apache.http.HttpException;
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import org.apache.http.HttpRequest;
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import org.apache.http.HttpRequestInterceptor;
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import org.apache.http.HttpVersion;
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import org.apache.http.ProtocolVersion;
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import org.apache.http.annotation.Immutable;
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import org.apache.http.client.config.RequestConfig;
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import org.apache.http.protocol.HTTP;
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import org.apache.http.protocol.HttpContext;
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import org.apache.http.util.Args;
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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.
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* <p/>
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* This interceptor takes into account {@link RequestConfig#isExpectContinueEnabled()}
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* setting.
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*
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* @since 4.3
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*/
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@Immutable
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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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Args.notNull(request, "HTTP request");
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if (!request.containsHeader(HTTP.EXPECT_DIRECTIVE)) {
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if (request instanceof HttpEntityEnclosingRequest) {
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final ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
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final 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
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&& entity.getContentLength() != 0 && !ver.lessEquals(HttpVersion.HTTP_1_0)) {
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final HttpClientContext clientContext = HttpClientContext.adapt(context);
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final RequestConfig config = clientContext.getRequestConfig();
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if (config.isExpectContinueEnabled()) {
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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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}
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