Apparently, it is not possible to setup an integration connecting to localhost, internal IP address, or internal network address. Source: Cannot make integration API calls - Plasmic Studio Questions - Plasmic Community
While certain things work like the postgres db, most don’t. Even for the self-hosted plasmic studio setup, the data fetcher fails for anything resolving to a local IP, thanks to the way URL’s are validated. Quite a bummer indeed.
What would be great is if we could connect our apps to internal company services like databases, ERP’s, etc. without having to create a REST API or custom code component or hosting the service on the web. Low-code is the future.
I believe this is possible, because I can connect using a REST API component (not available in the locally hosted Plasmic Studio for some reason) if I connect to my local app host. I think it would just be a matter of having an application-specific integration and piggybacking off that local app host.