don't send content-type

run.py

@@ -200,6 +200,7 @@ def get_file(filename):
     print_log('Warning', 'Unable to update access time. Is the file in the database?')
   if config["X-ACCEL-REDIRECT"]:
     r = make_response()
+    r.headers['Content-Type'] = ''
     r.headers['X-Accel-Redirect'] = os.path.join("/" + config["UPLOAD_FOLDER"], filename)
     return r
   # return text/plain for files with no extensions