Understanding GRPC
GRPC is a modern, open-source high-performance REMOTE PROCEDURE CALL (RPC) framework that can run in any environment. Originally developed by GOOGLE, it is now a hosted project of the CLOUD-NATIVE-COMPUTING-FOUNDATION (CNCF). It enables client and server applications to communicate transparently and makes it easier to build connected systems.
At the heart of GRPC lies PROTOCOL-BUFFERS, which serves as both its Interface Definition Language (IDL) and its message interchange format. By using a binary format rather than text-based formats like JSON, GRPC reduces the size of the payload and improves serialization speed. As noted in the official gRPC documentation, the framework is designed to work with HTTP2, providing features such as bidirectional streaming, flow control, and header compression.
Unlike a traditional REST-API, which is centered around resources and verbs, GRPC focuses on service definitions and methods. This makes it highly effective for MICROSERVICES architectures where polyglot environments are common. It supports multiple PROGRAMMING-LANGUAGES including Go, Java, Python, and C++. For more technical details on the transport layer, refer to the gRPC over HTTP2 specification and the CNCF blog.