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diff --git a/lib/servlet-api/javax/servlet/FilterChain.java b/lib/servlet-api/javax/servlet/FilterChain.java
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+++ b/lib/servlet-api/javax/servlet/FilterChain.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 javax.servlet;
+
+import java.io.IOException;
+
+/**
+ * A FilterChain is an object provided by the servlet container to the developer
+ * giving a view into the invocation chain of a filtered request for a resource.
+ * Filters use the FilterChain to invoke the next filter in the chain, or if the
+ * calling filter is the last filter in the chain, to invoke the resource at the
+ * end of the chain.
+ *
+ * @see Filter
+ * @since Servlet 2.3
+ **/
+
+public interface FilterChain {
+
+    /**
+     * Causes the next filter in the chain to be invoked, or if the calling
+     * filter is the last filter in the chain, causes the resource at the end of
+     * the chain to be invoked.
+     *
+     * @param request
+     *            the request to pass along the chain.
+     * @param response
+     *            the response to pass along the chain.
+     *
+     * @since 2.3
+     */
+    public void doFilter(ServletRequest request, ServletResponse response)
+            throws IOException, ServletException;
+
+}