改造緩存504不可訪問請求（僅緩存）錯誤

Question

我一直在測試改造緩存。我正在使用retrofit2.0.0 beta2和okhttp：3.2.0。這是我的代碼。

final Cache cache = new Cache(new File(context.getCacheDir(), CACHE_DIR), CACHE_SIZE); 
String cachePath = cache.getDirectory().getPath(); 

OkHttpClient okClient = new OkHttpClient(); 
okClient.setCache(cache); 
okClient.interceptors().add(logging); 

String FORCE_CACHE_HEADERS = "Cache-Control: public, only-if-cached, max-stale=" + Integer.MAX_VALUE; 

@GET("/")Call<RES> GETve(@QueryMap Map<String, String> params); 
@Headers({FORCE_CACHE_HEADERS})@GET("/")Call<RES> GETCacheve(@QueryMap Map<String, String> params); 

第一個請求是好的。

###Logging : --> GET https://xxx 
 
###Logging : --> END GET 
 
###OkHttpClient response : Response{protocol=http/1.1, code=200, message=OK, url=https://xxx 
 
###OkHttpClient response.cacheControl() : no-cache, public, max-stale=2419200 
 
###OkHttpClient response.cacheResponse() : null 
 
###Logging : <-- HTTP/1.1 200 OK (133ms) 
 
###Logging : Date: Mon, 11 Apr 2016 06:52:46 GMT 
 
###Logging : Server: Apache/2.2.25 (Unix) mod_ssl/2.2.25 OpenSSL/1.0.0-fips mod_jk/1.2.37 
 
###Logging : Pragma: no-cache 
 
###Logging : Expires: Thu, 01 Jan 1970 00:00:00 GMT 
 
###Logging : Content-Length: 190 
 
###Logging : Keep-Alive: timeout=5, max=100 
 
###Logging : Connection: Keep-Alive 
 
###Logging : Content-Type: text/html;charset=euc-kr 
 
###Logging : Content-Language: euc-kr 
 
###Logging : OkHttp-Sent-Millis: 1460357566280 
 
###Logging : OkHttp-Received-Millis: 1460357566290 
 
###Logging : Cache-Control: public, max-stale=2419200 
 
###Logging : <-- END HTTP (190-byte body) 
 
###response.code() : 200, isSuccess() : true

第二請求生成504錯誤。

###Logging : --> GET https://xxx HTTP/1.1 
 
###Logging : Cache-Control: public, only-if-cached, max-stale=2147483647 
 
###Logging : --> END GET 
 
###OkHttpClient response : Response{protocol=http/1.1, code=504, message=Unsatisfiable Request (only-if-cached), url=https://xxx 
 
###OkHttpClient response.cacheControl() : 
 
###OkHttpClient response.cacheResponse() : null 
 
###Logging : <-- HTTP/1.1 504 Unsatisfiable Request (only-if-cached) (3ms) 
 
###Logging : <-- END HTTP (0-byte body)

我試圖刪除附註。但是，一樣。和 結果使用後的男人，

的Cache-Control→無店鋪

附註→無緩存

爲什麼會造成這種不可滿足504請求（只，如果緩存的）錯誤？ 我該如何解決這個錯誤？

Answer 1

改造：2.0.0-BETA4，okhttp：3.2.0

private NetworkingAction(){ 
    long SIZE_OF_CACHE = 10 * 1024 * 1024; // 10 MB 
    Cache cache = new Cache(getCacheDir(), SIZE_OF_CACHE); 

    OkHttpClient okClient = new OkHttpClient 
      .Builder() 
      .addNetworkInterceptor(REWRITE_RESPONSE_INTERCEPTOR) 
      .addInterceptor(REWRITE_RESPONSE_INTERCEPTOR_OFFLINE) 
      .cache(cache) 
      .build(); 

    NetworkInterface service = new Retrofit.Builder() 
      .baseUrl(ServerConstants.API_URL) 
      .client(okClient) 
      .build() 
      .create(NetworkInterface.class); 

    service.getSomething().clone().enqueue(new Callback<ResponseBody>() { 
     @Override 
     public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) { 
      Log.d("TAG", "onResponse: "); 
     } 

     @Override 
     public void onFailure(Call<ResponseBody> call, Throwable t) { 
      Log.d("TAG", "onFailure: " + t.getMessage()); 
     } 
    }); 
} 

private final Interceptor REWRITE_RESPONSE_INTERCEPTOR = new Interceptor() { 
    @Override 
    public okhttp3.Response intercept(Chain chain) throws IOException { 
     okhttp3.Response originalResponse = chain.proceed(chain.request()); 
     String cacheControl = originalResponse.header("Cache-Control"); 
     if (cacheControl == null || cacheControl.contains("no-store") || cacheControl.contains("no-cache") || 
       cacheControl.contains("must-revalidate") || cacheControl.contains("max-age=0")) { 
      return originalResponse.newBuilder() 
        .header("Cache-Control", "public, max-age=" + 5000) 
        .build(); 
     } else { 
      return originalResponse; 
     } 
    } 
}; 

private final Interceptor REWRITE_RESPONSE_INTERCEPTOR_OFFLINE = new Interceptor() { 
    @Override 
    public okhttp3.Response intercept(Chain chain) throws IOException { 
     Request request = chain.request(); 
     if (!NetworkUtils.isNetworkAvailable(VenueDetailsActivity.this)) { 
      request = request.newBuilder() 
        .header("Cache-Control", "public, only-if-cached") 
        .build(); 
     } 
     return chain.proceed(request); 
    } 
}; 
public static boolean isOnline() { 
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); 
    NetworkInfo netInfo = cm.getActiveNetworkInfo(); 
    return netInfo != null && netInfo.isConnectedOrConnecting(); 

}

原來的答覆：https://stackoverflow.com/a/36795214/5784294