freerdp-webconnect IIS reverse proxy

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Hello

I'm trying to setup FreeRDP-WebConnect through an IIS proxy using URL Rewrite so it is accessible outside my LAN without exposing additional ports in my firewall besides 80 and 443.

Here is the issue:

When accessing the page through the re-written url everything seems to work correctly with the exception of the websocket.

looking at the HTML, it seems that the %WSURI% (var wsBase) is coming back as ws://localhost:8000/wsgate instead of using the external url. Im at a loss and would like to know if anyone knows how to remedy this by chance?

Here is a screenshot https://drive.google.com/file/d/0B5XV...