/*
* ====================================================================
* 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.
HttpException;
import org.apache.http.
HttpRequest;
import org.apache.http.
HttpRequestInterceptor;
import org.apache.http.annotation.
ThreadingBehavior;
import org.apache.http.annotation.
Contract;
import org.apache.http.util.
Args;
/**
* RequestConnControl is responsible for adding {@code Connection} header
* to the outgoing requests, which is essential for managing persistence of
* {@code HTTP/1.0} connections. This interceptor is recommended for
* client side protocol processors.
*
* @since 4.0
*/
@
Contract(threading =
ThreadingBehavior.
IMMUTABLE)
public class
RequestConnControl implements
HttpRequestInterceptor {
public
RequestConnControl() {
super();
}
@
Override
public void
process(final
HttpRequest request, final
HttpContext context)
throws
HttpException,
IOException {
Args.
notNull(
request, "HTTP request");
final
String method =
request.
getRequestLine().
getMethod();
if (
method.
equalsIgnoreCase("CONNECT")) {
return;
}
if (!
request.
containsHeader(
HTTP.
CONN_DIRECTIVE)) {
// Default policy is to keep connection alive
// whenever possible
request.
addHeader(
HTTP.
CONN_DIRECTIVE,
HTTP.
CONN_KEEP_ALIVE);
}
}
}