/*
* ====================================================================
* 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 org.apache.http.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.
ThreadingBehavior;
import org.apache.http.annotation.
Contract;
import org.apache.http.params.
CoreProtocolPNames;
import org.apache.http.util.
Args;
/**
* RequestExpectContinue is responsible for enabling the 'expect-continue'
* handshake by adding {@code Expect} header. This interceptor is
* recommended for client side protocol processors.
*
* @since 4.0
*/
@
Contract(threading =
ThreadingBehavior.
IMMUTABLE)
@
SuppressWarnings("deprecation")
public class
RequestExpectContinue implements
HttpRequestInterceptor {
private final boolean
activeByDefault;
/**
* @deprecated (4.3) use {@link org.apache.http.protocol.RequestExpectContinue#RequestExpectContinue(boolean)}
*/
@
Deprecated
public
RequestExpectContinue() {
this(false);
}
/**
* @since 4.3
*/
public
RequestExpectContinue(final boolean
activeByDefault) {
super();
this.
activeByDefault =
activeByDefault;
}
@
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 boolean
active =
request.
getParams().
getBooleanParameter(
CoreProtocolPNames.
USE_EXPECT_CONTINUE, this.
activeByDefault);
if (
active) {
request.
addHeader(
HTTP.
EXPECT_DIRECTIVE,
HTTP.
EXPECT_CONTINUE);
}
}
}
}
}
}