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Practical Microservices by Umesh Ram Sharma

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Different protocol

Sometimes, microservice can internally use different protocols to talk to each other; it can be thrift call, TCP, UDP, RMI, SOAP, and so on. For clients, there can be only one rest-based HTTP call. Clients hit the API Gateway with the HTTP protocol and the API Gateway can make the internal call in required protocol and combine the results in the end from all web service. It can respond to the client in required protocol; in most of the cases, that protocol will be HTTP.

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