Thanks for reply, but this is not what i need.
I don't use the querystring parameter, but Server Variables of IIS.
Inside Url Rewrite configuration of my web application, i can manage server variables as described here: https://learn.microsoft.com/en-us/iis/extensions/url-rewrite-module/url-rewrite-module-configuration-reference#using-server-variables-in-rewrite-rules
I need to read variable defined in this IIS Url Rewrite config from UniApplication.
Thanks