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      1 /*
      2  * Copyright (C) 2014 Square, Inc.
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.squareup.okhttp;
     17 
     18 import java.io.IOException;
     19 
     20 /**
     21  * Observes, modifies, and potentially short-circuits requests going out and the corresponding
     22  * requests coming back in. Typically interceptors will be used to add, remove, or transform headers
     23  * on the request or response.
     24  */
     25 public interface Interceptor {
     26   Response intercept(Chain chain) throws IOException;
     27 
     28   interface Chain {
     29     Request request();
     30     Response proceed(Request request) throws IOException;
     31     Connection connection();
     32   }
     33 }
     34