Issue connecting to internal service

Question

I have an external API server and an internal service that connect through gRPC. When the API calls the internal service I am receiving an error.

```
failed to add request: failed to exit idle mode: invalid target address http://boil-engine.railway.internal:8080, error info: address http://boil-engine.railway.internal:8080:443: too many colons in address

// Go code for gRPC server
	service, err := service.NewEngineService(config, logger)
	if err != nil {
		logger.WithField("error", err).Fatal("Failed to create engine service")
	}

lis, err := net.Listen("tcp", "[::]:"+config.Port)
	if err != nil {
		logger.WithField("error", err).Fatal("Failed to listen")
	}

grpcServer := grpc.NewServer()
	pb.RegisterEngineServiceServer(grpcServer, service)
```

Not sure where the 443: is coming from. I am running both the "boil-engine" and the external API in Docker containers with alpine image and exposing port 8080 in both. I am using HOST=0.0.0.0 and PORT as the one injected by Railway in both services.  
  
Any help appreciated.   
Thanks