spring security CacheControlServerHttpHeadersWriter 源码
spring security CacheControlServerHttpHeadersWriter 代码
文件路径：/web/src/main/java/org/springframework/security/web/server/header/CacheControlServerHttpHeadersWriter.java
/*
* Copyright 2002-2017 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
*
* https://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.server.header;
import reactor.core.publisher.Mono;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.web.server.ServerWebExchange;
/**
* Writes cache control related headers.
*
* <pre>
* Cache-Control: no-cache, no-store, max-age=0, must-revalidate
* Pragma: no-cache
* Expires: 0
* </pre>
*
* @author Rob Winch
* @since 5.0
*/
public class CacheControlServerHttpHeadersWriter implements ServerHttpHeadersWriter {
/**
* The value for expires value
*/
public static final String EXPIRES_VALUE = "0";
/**
* The value for pragma value
*/
public static final String PRAGMA_VALUE = "no-cache";
/**
* The value for cache control value
*/
public static final String CACHE_CONTRTOL_VALUE = "no-cache, no-store, max-age=0, must-revalidate";
/**
* The delegate to write all the cache control related headers
*/
private static final ServerHttpHeadersWriter CACHE_HEADERS = StaticServerHttpHeadersWriter.builder()
.header(HttpHeaders.CACHE_CONTROL, CacheControlServerHttpHeadersWriter.CACHE_CONTRTOL_VALUE)
.header(HttpHeaders.PRAGMA, CacheControlServerHttpHeadersWriter.PRAGMA_VALUE)
.header(HttpHeaders.EXPIRES, CacheControlServerHttpHeadersWriter.EXPIRES_VALUE).build();
@Override
public Mono<Void> writeHttpHeaders(ServerWebExchange exchange) {
if (exchange.getResponse().getStatusCode() == HttpStatus.NOT_MODIFIED) {
return Mono.empty();
}
return CACHE_HEADERS.writeHttpHeaders(exchange);
}
}
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