When using synchronous request/response-based

communication mechanism, use HTTP and REST protocols

that are the most common protocols.

▪ Expose APIs from our microservices using the HTTP and

REST protocols.

▪ REST HTTP calls using HTTP verbs like GET, POST, and

PUT.

▪ If our communication held between internal microservices, use

gRPC protocol communication mechanisms to provide high

performance and low latency.

▪ Use GraphQL instead of the REST APIs when performing

Request/response communication.

▪ With GraphQL, we can define the structure of the data

required and get 1 response in 1 request with more flexibility

and efficiency way to get whole data.

https://docs.oracle.com/cd/E13203_01/tuxedo/tux71/html/pgreq2.htm