/*
* Copyright 2002-2013 the original author or authors.
*
* Licensed 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.
*/
package org.springframework.security.web.header.writers;
import java.util.ArrayList;
import java.util.List;
import org.springframework.security.web.header.Header;
/**
* A {@link StaticHeadersWriter} that inserts headers to prevent caching.
* Specifically it adds the following headers:
* <ul>
* <li>Cache-Control: no-cache, no-store, max-age=0, must-revalidate</li>
* <li>Pragma: no-cache</li>
* <li>Expires: 0</li>
* </ul>
*
* @author Rob Winch
* @since 3.2
*/
public final class CacheControlHeadersWriter extends StaticHeadersWriter {
/**
* Creates a new instance
*/
public CacheControlHeadersWriter() {
super(createHeaders());
}
private static List<Header> createHeaders() {
List<Header> headers = new ArrayList<Header>(2);
headers.add(new Header("Cache-Control","no-cache, no-store, max-age=0, must-revalidate"));
headers.add(new Header("Pragma","no-cache"));
headers.add(new Header("Expires","0"));
return headers;
}
}