diff --git a/SDWebImage/SDWebImageDownloader.h b/SDWebImage/SDWebImageDownloader.h
index ffc929e..1fab7e4 100644
--- a/SDWebImage/SDWebImageDownloader.h
+++ b/SDWebImage/SDWebImageDownloader.h
@@ -13,7 +13,8 @@
 typedef enum
 {
     SDWebImageDownloaderLowPriority = 1 << 0,
-    SDWebImageDownloaderProgressiveDownload = 1 << 1
+    SDWebImageDownloaderProgressiveDownload = 1 << 1,
+    SDWebImageDownloaderEnableNSURLCache = 1 << 2
 } SDWebImageDownloaderOptions;
 
 typedef enum
diff --git a/SDWebImage/SDWebImageDownloader.m b/SDWebImage/SDWebImageDownloader.m
index 3401ee4..1dbe85a 100644
--- a/SDWebImage/SDWebImageDownloader.m
+++ b/SDWebImage/SDWebImageDownloader.m
@@ -120,7 +120,7 @@ static NSString *const kCompletedCallbackKey = @"completed";
     [self addProgressCallback:progressBlock andCompletedBlock:completedBlock forURL:url createCallback:^
     {
         // In order to prevent from potential duplicate caching (NSURLCache + SDImageCache) we disable the cache for image requests
-        NSMutableURLRequest *request = [NSMutableURLRequest.alloc initWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:15];
+        NSMutableURLRequest *request = [NSMutableURLRequest.alloc initWithURL:url cachePolicy:(options & SDWebImageDownloaderEnableNSURLCache ? NSURLRequestUseProtocolCachePolicy : NSURLRequestReloadIgnoringLocalCacheData) timeoutInterval:15];
         request.HTTPShouldHandleCookies = NO;
         request.HTTPShouldUsePipelining = YES;
         request.allHTTPHeaderFields = wself.HTTPHeaders;
diff --git a/SDWebImage/SDWebImageManager.h b/SDWebImage/SDWebImageManager.h
index 84316e1..a686978 100644
--- a/SDWebImage/SDWebImageManager.h
+++ b/SDWebImage/SDWebImageManager.h
@@ -31,7 +31,14 @@ typedef enum
      * This flag enables progressive download, the image is displayed progressively during download as a browser would do.
      * By default, the image is only displayed once completely downloaded.
      */
-    SDWebImageProgressiveDownload = 1 << 3
+    SDWebImageProgressiveDownload = 1 << 3,
+    /**
+     * Even if the image is cached, fetch the URL again anyway. When set, NSURLCache is enabled in the downloader.
+     * NSURLCache will handle the protocol caching logic while SDWebImage remains useful for offline images.
+     * This option helps deal with images changing behind the same request URL, e.g. Facebook graph api profile pics.
+     * If a cached image exists, the completion block is called once with the cached image and again with the final image.
+     */
+    SDWebImageRefreshCached = 1 << 4
 } SDWebImageOptions;
 
 typedef void(^SDWebImageCompletedBlock)(UIImage *image, NSError *error, SDImageCacheType cacheType);
diff --git a/SDWebImage/SDWebImageManager.m b/SDWebImage/SDWebImageManager.m
index 7a44560..5dc965d 100644
--- a/SDWebImage/SDWebImageManager.m
+++ b/SDWebImage/SDWebImageManager.m
@@ -97,16 +97,21 @@
         if (image)
         {
             completedBlock(image, nil, cacheType, YES);
-            @synchronized(self.runningOperations)
-            {
-                [self.runningOperations removeObject:operation];
+            if (!(options & SDWebImageRefreshCached)) {
+                @synchronized(self.runningOperations)
+                {
+                    [self.runningOperations removeObject:operation];
+                }
             }
         }
-        else if (![self.delegate respondsToSelector:@selector(imageManager:shouldDownloadImageForURL:)] || [self.delegate imageManager:self shouldDownloadImageForURL:url])
+
+        if ((!image || options & SDWebImageRefreshCached) && (![self.delegate respondsToSelector:@selector(imageManager:shouldDownloadImageForURL:)] || [self.delegate imageManager:self shouldDownloadImageForURL:url]))
         {
+            // download if no image or requested to refresh anyway, and download allowed by delegate
             SDWebImageDownloaderOptions downloaderOptions = 0;
             if (options & SDWebImageLowPriority) downloaderOptions |= SDWebImageDownloaderLowPriority;
             if (options & SDWebImageProgressiveDownload) downloaderOptions |= SDWebImageDownloaderProgressiveDownload;
+            if (options & SDWebImageRefreshCached) downloaderOptions |= SDWebImageDownloaderEnableNSURLCache;
             __block id<SDWebImageOperation> subOperation = [self.imageDownloader downloadImageWithURL:url options:downloaderOptions progress:progressBlock completed:^(UIImage *downloadedImage, NSData *data, NSError *error, BOOL finished)
             {
                 if (weakOperation.cancelled)
@@ -167,7 +172,7 @@
             }];
             operation.cancelBlock = ^{[subOperation cancel];};
         }
-        else
+        else if (!image)
         {
             // Image not in cache and download disallowed by delegate
             completedBlock(nil, nil, SDImageCacheTypeNone, YES);