> the specific gateway code can be extracted and then refactored? I In this case it's generally an attractive nuisance for business logic, aggregation, data t

> the specific gateway code can be extracted and then refactored? I In this case it's generally an attractive nuisance for business logic, aggregation, data transformation etc, which means that after a while 1) extracting the proxying is hard and 2) you can't understand a service without reading the code in multiple layers, since some of it's business logic is in the proxy layer. Big balls of mud can be big, distributed balls of mud.