content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed 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.csp.sentinel.adapter.spring.webmvc.callback;
  
  import javax.servlet.http.HttpServletRequest;
  
  /**
   * The origin parser parses request origin (e.g. IP, user, appName) from HTTP request.
   *
   * @author kaizi2009
   */
  public interface RequestOriginParser {
  
      /**
       * Parse the origin from given HTTP request.
       *
       * @param request HTTP request
       * @return parsed origin
       */
      String parseOrigin(HttpServletRequest request);
  }
  