content: /*
   *
   * 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 com.alibaba.cloudapp.api.gateway;
  
  import com.alibaba.cloudapp.exeption.CloudAppException;
  
  import javax.servlet.*;
  
  public abstract class GatewayProxyServletFilter implements Filter, Authorized {
  
      /*
       * Default content type
       */
      String DEFAULT_CONTENT_TYPE = "application/octet-stream";
  
      /*
       * Default content encoding
       */
      String DEFAULT_CONTENT_ENCODING = "UTF-8";
  
  
      @Override
      public void doFilter(ServletRequest request, ServletResponse response,
                           FilterChain chain) throws ServletException {
          try {
              proxy(request, response);
          } catch (Throwable t) {
              throw new ServletException(t);
          }
      }
  
      /**
       * Proxy the original servlet request to the gateway server directly.
       *
       * @param request the original servlet request
       * @param response the response to the original servlet request
       *
       * @throws CloudAppException exception
       */
      public abstract void proxy(ServletRequest request, ServletResponse response)
              throws CloudAppException;
  }
  