URL Rewrite no Redirect if url includes "Demo"

URL Rewrite no Redirect if url includes "Demo"

We have setup our IIS to redirect all incomming traffic to site.com to use
https. But we need to make an exception if the user inputs the subdomain
demo.site.com to NOT use https.
So i guess we will need to put in some argument in our web.config to
stopProcessing the redirect if someone tries to access the subdomain
demo.site.com