OKHttp? Retrofit?? ????? ? ??? ???? ??? ? ?????

Retrofit ? OKHttp? ???? HTTP ??? ????? ???? ?? ??? ??????. ????? ? RetrofitError UnknownHostException? ?????. ?? Retrofit? ??? ???? ??? ? ??? ?????. ? ??? ????? ?? ??? ?????.

Retrofit 2.x? ??:

• OkHttp ????? ???? ?? ??? ?????.

  <code class="java">private static final Interceptor REWRITE_CACHE_CONTROL_INTERCEPTOR = new Interceptor() {
    @Override
    public Response intercept(Chain chain) throws IOException {
        Response originalResponse = chain.proceed(chain.request());
        if (Utils.isNetworkAvailable(context)) {
            int maxAge = 60; // read from cache for 1 minute
            return originalResponse.newBuilder()
                    .header("Cache-Control", "public, max-age=" + maxAge)
                    .build();
        } else {
            int maxStale = 60 * 60 * 24 * 28; // tolerate 4-weeks stale
            return originalResponse.newBuilder()
                    .header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale)
                    .build();
        }
    }
  }</code>

• ????? ??? OkHttpClient ??:

  <code class="java">OkHttpClient client = new OkHttpClient();
  client.networkInterceptors().add(REWRITE_CACHE_CONTROL_INTERCEPTOR);
  
  //setup cache
  File httpCacheDirectory = new File(context.getCacheDir(), "responses");
  int cacheSize = 10 * 1024 * 1024; // 10 MiB
  Cache cache = new Cache(httpCacheDirectory, cacheSize);
  
  //add cache to the client
  client.setCache(cache);</code>

• OkHttpClient? Retrofit? ??:

  <code class="java">Retrofit retrofit = new Retrofit.Builder()
        .baseUrl(BASE_URL)
        .client(client)
        .addConverterFactory(GsonConverterFactory.create())
        .build();</code>

OKHttp 2.0.x:

• ????? ??? ????? ????? ??? ?????.

  <code class="java">      File httpCacheDirectory = new File(context.getCacheDir(), "responses");
  
        Cache cache = null;
        try {
            cache = new Cache(httpCacheDirectory, 10 * 1024 * 1024);
        } catch (IOException e) {
            Log.e("OKHttp", "Could not create http cache", e);
        }
  
        OkHttpClient okHttpClient = new OkHttpClient();
        if (cache != null) {
            okHttpClient.setCache(cache);
        }
        ...</code>

?? ??:

• Retrofit? ???? ?? ? ??? ??? ?? ??? Cache-Control: public? ???? ??? ?????.

• ???? ???? ?? Cache-Control ??? ???? ?? ????? ?????.

  <code class="java">RestAdapter.Builder builder= new RestAdapter.Builder()
   .setRequestInterceptor(new RequestInterceptor() {
        @Override
        public void intercept(RequestFacade request) {
            request.addHeader("Accept", "application/json;versions=1");
            if (MyApplicationUtils.isNetworkAvailable(context)) {
                int maxAge = 60; // read from cache for 1 minute
                request.addHeader("Cache-Control", "public, max-age=" + maxAge);
            } else {
                int maxStale = 60 * 60 * 24 * 28; // tolerate 4-weeks stale
                request.addHeader("Cache-Control", 
                    "public, only-if-cached, max-stale=" + maxStale);
            }
        }
  });</code>

??? ?? ??? ?????? Retrofit? ??? ?? ????? ? ??? ???? ???? ?????. ?? ??? ??? Cache-Control ??? ???? ??? ???.

? ??? OKHttp? ???? ????? ? ??? ???? ??? ? ?????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!