  The aim of this contribution is to analyse practical aspects of the use of
REST APIs and gRPC to realize communication tasks in applications in
microservice-based ecosystems. On the basis of performed experiments, classes
of communication tasks, for which given technology performs data transfer more
efficiently, have been established. This, in turn, allows formulation of
criteria for the selection of appropriate communication methods for
communication tasks to be performed in an application using microservices-based
architecture.
