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.recipes; 17 18 import com.squareup.okhttp.Cache; 19 import com.squareup.okhttp.Interceptor; 20 import com.squareup.okhttp.OkHttpClient; 21 import com.squareup.okhttp.Request; 22 import com.squareup.okhttp.Response; 23 import java.io.File; 24 import java.io.IOException; 25 26 public final class RewriteResponseCacheControl { 27 /** Dangerous interceptor that rewrites the server's cache-control header. */ 28 private static final Interceptor REWRITE_CACHE_CONTROL_INTERCEPTOR = new Interceptor() { 29 @Override public Response intercept(Chain chain) throws IOException { 30 Response originalResponse = chain.proceed(chain.request()); 31 return originalResponse.newBuilder() 32 .header("Cache-Control", "max-age=60") 33 .build(); 34 } 35 }; 36 37 private final OkHttpClient client; 38 39 public RewriteResponseCacheControl(File cacheDirectory) throws Exception { 40 Cache cache = new Cache(cacheDirectory, 1024 * 1024); 41 cache.evictAll(); 42 43 client = new OkHttpClient(); 44 client.setCache(cache); 45 } 46 47 public void run() throws Exception { 48 for (int i = 0; i < 5; i++) { 49 System.out.println(" Request: " + i); 50 51 Request request = new Request.Builder() 52 .url("https://api.github.com/search/repositories?q=http") 53 .build(); 54 55 if (i == 2) { 56 // Force this request's response to be written to the cache. This way, subsequent responses 57 // can be read from the cache. 58 System.out.println("Force cache: true"); 59 client.networkInterceptors().add(REWRITE_CACHE_CONTROL_INTERCEPTOR); 60 } else { 61 System.out.println("Force cache: false"); 62 client.networkInterceptors().clear(); 63 } 64 65 Response response = client.newCall(request).execute(); 66 response.body().close(); 67 if (!response.isSuccessful()) throw new IOException("Unexpected code " + response); 68 69 System.out.println(" Network: " + (response.networkResponse() != null)); 70 System.out.println(); 71 } 72 } 73 74 public static void main(String... args) throws Exception { 75 new RewriteResponseCacheControl(new File("RewriteResponseCacheControl.tmp")).run(); 76 } 77 } 78
