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 { intercept(Chain chain)26 Response intercept(Chain chain) throws IOException; 27 28 interface Chain { request()29 Request request(); proceed(Request request)30 Response proceed(Request request) throws IOException; connection()31 Connection connection(); 32 } 33 } 34