tsNet - load HTTPS from server with self-signed certificate?

[Ben Rubinstein]

Attempting to load a URL over https, from a server with a self-signed 
certificate. The error is:

  tsneterr: (60) schannel: SEC_E_UNTRUSTED_ROOT (0x80090325) - The certificate 
chain was issued by an authority that is not trusted.


This is a server we manage. If you accessed it in a browser, you'd get a 
warning explaining the issue, and have the choice to say I understand, get it 
anyway. Is there a way in tsNet to tell it to accept this certificate 
(otherwise we have to load it over http, which is even less secure!)?\

TIA,

Ben