gRPC-Web

A protocol adaptation that enables browser JavaScript clients to communicate with gRPC backends via an HTTP/1.1 or HTTP/2 proxy translation layer, since browsers cannot directly control HTTP/2 framing. A proxy (Envoy or grpc-web middleware) translates between the browser's fetch requests and the backend's native gRPC protocol. gRPC-Web supports unary and server-streaming calls but not client or bidirectional streaming.