gRPC
ProtocolsgRPC is a high-performance remote procedure call (RPC) framework that lets services communicate by calling methods on each other as if they were local functions. It typically uses HTTP/2 for transport and Protocol Buffers for compact, strongly typed messages. gRPC supports streaming, authentication, and code generation across many languages, making it common for microservices and internal APIs.
How It Works
gRPC defines service interfaces and message schemas in a .proto file using Protocol Buffers. From that definition, tooling generates client and server stubs for languages like Go, Java, Python, Node.js, and C#. The generated code enforces types and provides method signatures, so developers focus on business logic while gRPC handles serialization, network calls, retries (when implemented), and error mapping.
On the wire, gRPC commonly runs over HTTP/2, which enables multiplexing many concurrent requests over a single connection, header compression, and bidirectional streaming. gRPC supports four call patterns: unary (single request/response), server streaming, client streaming, and bidirectional streaming. Security is typically provided via TLS, and authentication is often layered using tokens (for example, JWT) passed as metadata. Because browsers have limited native gRPC support, many deployments use gRPC-Web or an HTTP/JSON gateway for frontend compatibility.
Why It Matters for Web Hosting
If your application uses gRPC, your hosting environment must support HTTP/2 end-to-end and allow the necessary ports, load balancers, and reverse proxies to pass gRPC traffic correctly. Plan comparisons should consider whether the provider supports containerized deployments (Docker/Kubernetes), offers TLS termination that is gRPC-aware, and can handle long-lived streaming connections. These details affect latency, reliability, and whether your services can communicate without falling back to slower HTTP/JSON APIs.
Common Use Cases
- Microservices communication within a private network or cluster
- High-throughput internal APIs between backend services
- Real-time streaming features (telemetry, chat, event feeds) using bidirectional streams
- Polyglot systems where different services are written in different languages
- Service-to-service calls behind an API gateway with optional HTTP/JSON transcoding
gRPC vs REST
gRPC uses strongly typed contracts (Protobuf) and is optimized for service-to-service calls, often delivering lower overhead and better streaming support than typical REST over HTTP/1.1. REST commonly uses human-readable JSON and is broadly compatible with browsers and tooling, making it simpler for public APIs. In hosting terms, REST usually works with standard proxies and caching, while gRPC may require HTTP/2-capable load balancing and special proxy configuration for streaming and timeouts.