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/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*
*/
package org.apache.http.client.protocol;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.HttpVersion;
import org.apache.http.ProtocolVersion;
import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.protocol.HTTP;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.Args;
/**
* RequestExpectContinue is responsible for enabling the 'expect-continue'
* handshake by adding {@code Expect} header.
*
* This interceptor takes into account {@link RequestConfig#isExpectContinueEnabled()}
* setting.
*
*
* @since 4.3
*/
@Contract(threading = ThreadingBehavior.IMMUTABLE)
public class RequestExpectContinue implements HttpRequestInterceptor {
public RequestExpectContinue() {
super();
}
@Override
public void process(final HttpRequest request, final HttpContext context)
throws HttpException, IOException {
Args.notNull(request, "HTTP request");
if (!request.containsHeader(HTTP.EXPECT_DIRECTIVE)) {
if (request instanceof HttpEntityEnclosingRequest) {
final ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
final HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity();
// Do not send the expect header if request body is known to be empty
if (entity != null
&& entity.getContentLength() != 0 && !ver.lessEquals(HttpVersion.HTTP_1_0)) {
final HttpClientContext clientContext = HttpClientContext.adapt(context);
final RequestConfig config = clientContext.getRequestConfig();
if (config.isExpectContinueEnabled()) {
request.addHeader(HTTP.EXPECT_DIRECTIVE, HTTP.EXPECT_CONTINUE);
}
}
}
}
}
}
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