Player API: RequiredFiles download type?

Hi, I see that files will be listed to be downloaded through xmds or http, and we need to follow that.

I’ve tried this API in two dev computers and one always gets to download through http and the other through xmds.

Can we

a) know which criteria is followed to provide http or xmds links?
b) force RequiredFiles to provide http or xmds links?

Thank you!