swaggerwcf | Swagger for WCF - Generates Swagger | REST library

My WCF service is locally hosted like this:
localhost/service.svc
On the server it's hosted like this:
servername/extra/service.svc
When making a request SwaggerWcf uses the base path and adds the configered elements: localhost/user/parameter
But it should be:
localhost/extra/user/parameter
So I need WCF to not just use the hostname, but also a little more of the url.
I could add it to the SwaggerWcf configuration, which is user and could be extra/user. But then it won't work locally anymore.

I've tried adding a Config class that could read configuration attributes statically: