sketch of what a gRPC backend to nginx might look like based off https://github.com/grpc/grpc.github.io/issues/230#issuecomment-328827358

grpc.conf

server {
  listen 8443 ssl http2;
  listen [::]:8443 ssl http2;
  ssl_certificate /some/place/server.crt;
  ssl_certificate_key /some/place/server.key;
}

location /internal {
  proxy_http_version 2.0;
  proxy_pass http://$some_ip:50051;
  proxy_set_header X-REAL-IP $remote_addr;
  proxy_request_buffering off;
}