Switch back to send_file and add a bit of gzip buffering

endpoints/verbs.py

@@ -58,9 +58,6 @@ def get_squashed_tag(namespace, repository, tag, headers):
         yield current_image_stream
 
     stream = GzipWrap(StreamLayerMerger(get_next_layer).get_generator())
-    return app.response_class(wrap_file(request.environ, stream, 1024 * 16),
-                              mimetype='application/octet-stream',
-                              direct_passthrough=True)
-    
+    return send_file(stream)
 
   abort(403)