Servlet Filter for adding the vary header to the response.

git-svn-id: https://svn.libreccm.org/ccm/trunk@4908 8810af33-2d31-482b-a856-94f89814c4df

ccm-sci-bundle/src/com/arsdigita/bundle/AddVaryHeaderFilter.java

@@ -0,0 +1,45 @@
+package com.arsdigita.bundle;
+
+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;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class AddVaryHeaderFilter implements Filter {
+
+    @Override
+    public void init(final FilterConfig filterConfig) throws ServletException {
+    }
+
+    @Override
+    public void doFilter(final ServletRequest servletRequest,
+                         final ServletResponse servletResponse,
+                         final FilterChain filterChain)
+        throws IOException, ServletException {
+
+        if (servletResponse instanceof HttpServletResponse) {
+
+            final HttpServletResponse response
+                                      = (HttpServletResponse) servletResponse;
+
+            response.addHeader("Vary", "accept-language");
+
+            filterChain.doFilter(servletRequest, servletResponse);
+        }
+
+    }
+
+    @Override
+    public void destroy() {
+    }
+
+}