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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
* <http://www.apache.org/>.
*
*/
package ch.boye.httpclientandroidlib.protocol;
import java.io.IOException;
import ch.boye.httpclientandroidlib.HttpEntity;
import ch.boye.httpclientandroidlib.HttpEntityEnclosingRequest;
import ch.boye.httpclientandroidlib.HttpException;
import ch.boye.httpclientandroidlib.HttpRequest;
import ch.boye.httpclientandroidlib.HttpRequestInterceptor;
import ch.boye.httpclientandroidlib.HttpVersion;
import ch.boye.httpclientandroidlib.ProtocolVersion;
import ch.boye.httpclientandroidlib.annotation.Immutable;
import ch.boye.httpclientandroidlib.params.CoreProtocolPNames;
import ch.boye.httpclientandroidlib.util.Args;
/**
* RequestExpectContinue is responsible for enabling the 'expect-continue'
* handshake by adding <code>Expect</code> header. This interceptor is
* recommended for client side protocol processors.
*
* @since 4.0
*/
@Immutable
@SuppressWarnings("deprecation")
public class RequestExpectContinue implements HttpRequestInterceptor {
private final boolean activeByDefault;
/**
* @deprecated (4.3) use {@link ch.boye.httpclientandroidlib.protocol.RequestExpectContinue#RequestExpectContinue(boolean)}
*/
@Deprecated
public RequestExpectContinue() {
this(false);
}
/**
* @since 4.3
*/
public RequestExpectContinue(final boolean activeByDefault) {
super();
this.activeByDefault = activeByDefault;
}
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 boolean active = request.getParams().getBooleanParameter(
CoreProtocolPNames.USE_EXPECT_CONTINUE, this.activeByDefault);
if (active) {
request.addHeader(HTTP.EXPECT_DIRECTIVE, HTTP.EXPECT_CONTINUE);
}
}
}
}
}
}
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