Protocol Buffers has evolved over two decades, transitioning from a performance-critical internal tool at Google to the default wire format for distributed systems.
While the core philosophy has remained constant, the language has evolved to support more platforms and complex engineering needs.
These open-source projects publish their Protobuf definitions in the open, but they are a small sample. Protobuf underpins internal APIs at companies of every size, and most of those schemas never leave private repositories.
Protobuf schemas can define services as well as messages, and an RPC framework turns those definitions into working clients and servers. There are only two you need to know: gRPC and ConnectRPC.
The most widely deployed Protobuf RPC framework. Originally developed by Google, it uses HTTP/2 and supports bidirectional streaming and server reflection.
Visit SiteA Protobuf RPC framework that speaks three protocols from one implementation: its own HTTP-based protocol, gRPC, and gRPC-Web. Its requests are plain HTTP, so they work natively in browsers and can be debugged with curl.
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