API gateways present the URL for an API, use rules that govern the use of that API, and immediate the API simply call towards the pertinent backend. Ordinarily, a gateway will know both the API specification and details of the rules it really should apply. two《grant A B》⇔《grant B to https://frenchlearninginstitutesi48890.dbblog.net/9473174/how-much-you-need-to-expect-you-ll-pay-for-a-good-backend-app-development-company