diff --git a/SDWebImage/SDWebImageDownloader.h b/SDWebImage/SDWebImageDownloader.h
index db57e9da..3d0921c6 100644
--- a/SDWebImage/SDWebImageDownloader.h
+++ b/SDWebImage/SDWebImageDownloader.h
@@ -33,7 +33,12 @@ typedef enum
      * Handles cookies stored in NSHTTPCookieStore by setting 
      * NSMutableURLRequest.HTTPShouldHandleCookies = YES;
      */
-    SDWebImageDownloaderHandleCookies = 1 << 5
+    SDWebImageDownloaderHandleCookies = 1 << 5,
+    /**
+     * Enable to allow untrusted SSL ceriticates.
+     * Useful for testing purposes. Use with caution in production.
+     */
+    SDWebImageDownloaderAllowInvalidSSLCertificates = 1 << 6
 
 } SDWebImageDownloaderOptions;
 
diff --git a/SDWebImage/SDWebImageDownloaderOperation.m b/SDWebImage/SDWebImageDownloaderOperation.m
index 552b7982..e0196001 100644
--- a/SDWebImage/SDWebImageDownloaderOperation.m
+++ b/SDWebImage/SDWebImageDownloaderOperation.m
@@ -371,5 +371,21 @@
     return self.options & SDWebImageDownloaderContinueInBackground;
 }
 
+- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace
+{
+    return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];
+}
+
+- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
+{
+    BOOL trustAllCertificates = (self.options & SDWebImageDownloaderAllowInvalidSSLCertificates);
+    if (trustAllCertificates && [challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust])
+    {
+        [challenge.sender useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust]
+             forAuthenticationChallenge:challenge];
+    }
+    
+    [challenge.sender continueWithoutCredentialForAuthenticationChallenge:challenge];
+}
 
 @end
diff --git a/SDWebImage/SDWebImageManager.h b/SDWebImage/SDWebImageManager.h
index b6df499a..688d4572 100644
--- a/SDWebImage/SDWebImageManager.h
+++ b/SDWebImage/SDWebImageManager.h
@@ -51,7 +51,12 @@ typedef enum
      * Handles cookies stored in NSHTTPCookieStore by setting
      * NSMutableURLRequest.HTTPShouldHandleCookies = YES;
      */
-    SDWebImageHandleCookies = 1 << 6
+    SDWebImageHandleCookies = 1 << 6,
+    /**
+     * Enable to allow untrusted SSL ceriticates.
+     * Useful for testing purposes. Use with caution in production.
+     */
+    SDWebImageAllowInvalidSSLCertificates = 1 << 7
 } SDWebImageOptions;
 
 typedef void(^SDWebImageCompletedBlock)(UIImage *image, NSError *error, SDImageCacheType cacheType);
diff --git a/SDWebImage/SDWebImageManager.m b/SDWebImage/SDWebImageManager.m
index e1ab9d13..2c9bafe9 100644
--- a/SDWebImage/SDWebImageManager.m
+++ b/SDWebImage/SDWebImageManager.m
@@ -146,6 +146,7 @@
             if (options & SDWebImageRefreshCached) downloaderOptions |= SDWebImageDownloaderUseNSURLCache;
             if (options & SDWebImageContinueInBackground) downloaderOptions |= SDWebImageDownloaderContinueInBackground;
             if (options & SDWebImageHandleCookies) downloaderOptions |= SDWebImageDownloaderHandleCookies;
+            if (options & SDWebImageAllowInvalidSSLCertificates) downloaderOptions |= SDWebImageDownloaderAllowInvalidSSLCertificates;
             if (image && options & SDWebImageRefreshCached)
             {
                 // force progressive off if image already cached but forced refreshing