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- /*
- * Copyright (C) 2010, Google Inc. and others
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Distribution License v. 1.0 which is available at
- * https://www.eclipse.org/org/documents/edl-v10.php.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
- package org.eclipse.jgit.http.server;
-
- import static org.eclipse.jgit.util.HttpSupport.HDR_CACHE_CONTROL;
- import static org.eclipse.jgit.util.HttpSupport.HDR_EXPIRES;
- import static org.eclipse.jgit.util.HttpSupport.HDR_PRAGMA;
-
- import java.io.IOException;
-
- import javax.servlet.Filter;
- import javax.servlet.FilterChain;
- import javax.servlet.FilterConfig;
- import javax.servlet.ServletException;
- import javax.servlet.ServletRequest;
- import javax.servlet.ServletResponse;
- import javax.servlet.http.HttpServletResponse;
-
- /** Add HTTP response headers to prevent caching by proxies/browsers. */
- class NoCacheFilter implements Filter {
- /** {@inheritDoc} */
- @Override
- public void init(FilterConfig config) throws ServletException {
- // Do nothing.
- }
-
- /** {@inheritDoc} */
- @Override
- public void destroy() {
- // Do nothing.
- }
-
- /** {@inheritDoc} */
- @Override
- public void doFilter(ServletRequest request, ServletResponse response,
- FilterChain chain) throws IOException, ServletException {
- HttpServletResponse rsp = (HttpServletResponse) response;
-
- rsp.setHeader(HDR_EXPIRES, "Fri, 01 Jan 1980 00:00:00 GMT");
- rsp.setHeader(HDR_PRAGMA, "no-cache");
-
- final String nocache = "no-cache, max-age=0, must-revalidate";
- rsp.setHeader(HDR_CACHE_CONTROL, nocache);
-
- chain.doFilter(request, response);
- }
- }
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