README

https://github.com/grpc-ecosystem/grpc-gateway

The grpc

protoc -I .
--go_out ./gen/go/ --go_opt paths=source_relative
--go-grpc_out ./gen/go/ --go-grpc_opt paths=source_relative
your/service/v1/your_service.proto

Just the gateway stubs

protoc -I . --grpc-gateway_out ./gen/go
--grpc-gateway_opt logtostderr=true
--grpc-gateway_opt paths=source_relative
--grpc-gateway_opt generate_unbound_methods=true
your/service/v1/your_service.proto

buf mod update

Annotations

https://github.com/grpc-ecosystem/grpc-gateway/blob/master/examples/internal/proto/examplepb/a_bit_of_everything.proto