com.squareup.okhttp.recipes.RewriteResponseCacheControl Maven / Gradle / Ivy
/*
* Copyright (C) 2014 Square, Inc.
*
* 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.squareup.okhttp.recipes;
import com.squareup.okhttp.Cache;
import com.squareup.okhttp.Interceptor;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;
import java.io.File;
import java.io.IOException;
public final class RewriteResponseCacheControl {
/** Dangerous interceptor that rewrites the server's cache-control header. */
private static final Interceptor REWRITE_CACHE_CONTROL_INTERCEPTOR = new Interceptor() {
@Override public Response intercept(Chain chain) throws IOException {
Response originalResponse = chain.proceed(chain.request());
return originalResponse.newBuilder()
.header("Cache-Control", "max-age=60")
.build();
}
};
private final OkHttpClient client;
public RewriteResponseCacheControl(File cacheDirectory) throws Exception {
Cache cache = new Cache(cacheDirectory, 1024 * 1024);
cache.evictAll();
client = new OkHttpClient();
client.setCache(cache);
}
public void run() throws Exception {
for (int i = 0; i < 5; i++) {
System.out.println(" Request: " + i);
Request request = new Request.Builder()
.url("https://api.github.com/search/repositories?q=http")
.build();
if (i == 2) {
// Force this request's response to be written to the cache. This way, subsequent responses
// can be read from the cache.
System.out.println("Force cache: true");
client.networkInterceptors().add(REWRITE_CACHE_CONTROL_INTERCEPTOR);
} else {
System.out.println("Force cache: false");
client.networkInterceptors().clear();
}
Response response = client.newCall(request).execute();
response.body().close();
if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
System.out.println(" Network: " + (response.networkResponse() != null));
System.out.println();
}
}
public static void main(String... args) throws Exception {
new RewriteResponseCacheControl(new File("RewriteResponseCacheControl.tmp")).run();
}
}