Java tutorial
// Copyright 2015 HSL <https://www.hsl.fi> // This program is dual-licensed under the EUPL v1.2 and AGPLv3 licenses. package fi.hsl.parkandride; import org.springframework.util.StringUtils; import javax.servlet.*; import javax.servlet.http.HttpServletResponse; import java.io.IOException; public class ApplicationVersionFilter implements Filter { private final String version; public ApplicationVersionFilter(String version) { this.version = version; } @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletResponse response = (HttpServletResponse) res; if (StringUtils.hasText(version)) { response.setHeader("Liipi-Version", version); } chain.doFilter(req, res); } @Override public void destroy() { } }