Proxygen web server

[20192028atnacat]

If a folder 'my' exists, in which 'index.php' is, requesting '/my' returns a header with '301 Moved Permanently' and 'Location: /my/'.
At Facebook, for example '/pages/creation/' and '/pages/creation' (both) return '200 OK'.
In addition, there are some header informations removed at Facebook, like 'X-Powered-By: HHVM/4.172.0'.

Is there any config file since I found no ini setting?

Version: HHVM/4.172.0