Merge pull request #2 from swilla/master

Make sure stream is seekable before using 'rewind()'

Author: reinink

src/Responses/SymfonyResponseFactory.php

@@ -46,7 +46,9 @@ public function create(FilesystemInterface $cache, $path)
         }
 
         $response->setCallback(function () use ($stream) {
-            rewind($stream);
+            if (ftell($stream) !== 0) {
+                rewind($stream);
+            }
             fpassthru($stream);
             fclose($stream);
         });