I'm having an issue with route_prefix and cors matching a service through url.

We're running the application in several setups.

• There's a frontend UI application
• There's also pyramid application using cornice, we're trying to introduce an api prefix to all routes.

We're running it either behind a single nginx that serves both: UI on the root path and pyramid app behind am api prefix or in more like dev environment on different ports. While the single host works great, the separate ports deployment causes an issue in that endpoints are not passing CORS check correctly from the UI. If I remove the route_prefix, everything works correctly and I'm not sure what's happening here.