Socket.io xdomain https flashsockets

Socket.io xdomain https flashsockets

Is it possible to have a secure flashsocket connection with a XDomain
socket.io app? On the socket.io-client I see the following comment:
* The FlashSocket transport. This is a API wrapper for the HTML5 WebSocket
* specification. It uses a .swf file to communicate with the server. If
you want
* to serve the .swf file from a other server than where the Socket.IO
script is
* coming from you need to use the insecure version of the .swf. More
information
* about this can be found on the github page.
but cant find the spot on the github page that talks about why it's not
possible to use https, xdomain flashsockets with socket.io. I'm using
flashsockets for older IE... Seems more reliable than other transports.
On my app, the js is served from a subdomain of my domain on server X, and
the .swf would be server from another server, on a different subdomain of
the same domain:
script is served from sub1.mydomain.com on server X
flash is served and connects to sub2.mydomain.com on server Y (holds
socket.io server)
Thanks for your help!