Byte range request for any uploaded file on Openfire is not enabled

[piasKolpolok]

Hi We are using Openfire 4.5.1

We are trying to generate thumbnail image of any uploaded video/file in Openfire xmpp server from our iOS client app. The code that we are using to generate thumbnail image it requests byte range of the selected url. But byte range request is not enabled in Openfire server for any file. How can I enable byte range request in Openfire server.

Accept-Ranges: bytes