Custom RPC protocols with a binary encoding format can achieve better performance than something generic like JSON over REST. However, a RESTful API has other significant advantages: it is good for experimentation and debugging (you can simply make requests to it using a web browser or the command-line tool curl, without any code generation or software installation), it is supported by all mainstream programming languages and platforms, and there is a vast ecosystem of tools available (servers, caches, load balancers, proxies, firewalls, monitoring, debugging tools, testing tools, etc.). For
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