使用Retrofit 2.0和okhttp3进行缓存 [英] Caching with Retrofit 2.0 and okhttp3

问题描述

我正在尝试使用Retrofit和OkHttp实现缓存.这是我已经完成的事情:

I'm trying to implement caching using Retrofit and OkHttp. Here what I've already done:

private static final Interceptor REWRITE_CACHE_CONTROL_INTERCEPTOR = new Interceptor() {

        @Override public Response intercept(Interceptor.Chain chain) throws IOException {
            Request originalRequest = chain.request();
            Request.Builder request = originalRequest.newBuilder();
            Response response = chain.proceed(request.build());
            return response.newBuilder()
                    .removeHeader("Pragma")
                    .removeHeader("Cache-Control")
                    .header("Cache-Control", "max-age=2419200")
                    .build();
        }
    };

    @Provides
    @Singleton
    OkHttpClient provideHttpClient(Context context) {


        File httpCacheDirectory = new File(context.getCacheDir(), "responses");
        int cacheSize = 10 * 1024 * 1024; // 10 MiB
        Cache cache = new Cache(httpCacheDirectory, cacheSize);


        HttpLoggingInterceptor oggingInterceptor = new HttpLoggingInterceptor();
        oggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        return new OkHttpClient.Builder()
                .cache(cache)
                .connectTimeout(3, TimeUnit.SECONDS)
                .writeTimeout(3, TimeUnit.SECONDS)
                .readTimeout(3, TimeUnit.SECONDS)
                .addInterceptor(REWRITE_CACHE_CONTROL_INTERCEPTOR)
                .addInterceptor(oggingInterceptor).build();
    }

然后将这个拦截器添加到HTTP客户端:

And then I'm adding this interceptor to the HTTP client:

.addInterceptor(REWRITE_CACHE_CONTROL_INTERCEPTOR)

.addInterceptor(REWRITE_CACHE_CONTROL_INTERCEPTOR)

我的 response 目录中有文件，但是当我尝试在没有Internet连接的情况下加载内容时，会出现以下错误:

I've got files inside my responses directory, however when I try to load content without internet connection, it gives me the following error:

无法解析主机"example.com":没有与主机名关联的地址

我只想将http响应存储在某个地方，如果没有互联网连接就将其加载.

I just want to store my http response somewhere and load it if there are no internet connection.

如果存在Internet连接，我想重写缓存.

If there is an Internet connection, I want to rewrite cache.

推荐答案

以这种方式设置标头(恰好50000)解决了该问题.

Setting header this way (exactly 50000) solved the issue.

.header("Cache-Control", String.format("max-age=%d", 50000))

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