Simple gRPC routing with Envoy

simple-grpc-routing.yaml

static_resources:
      listeners:
        - address:
            socket_address:
              address: 0.0.0.0
              port_value: 8000
          filter_chains:
            - filters:
                - name: envoy.http_connection_manager
                  typed_config:
                    "@type": type.googleapis.com/envoy.config.filter.network.http_connection_manager.v2.HttpConnectionManager
                    codec_type: auto
                    stat_prefix: http_inbound_upstream_api_service
                    access_log:
                      - name: envoy.file_access_log
                        config:
                          path: /dev/stdout
                    route_config:
                      name: local_route
                      virtual_hosts:
                        - name: backend_service
                          domains:
                            - "*"
                          routes:
                            - match:
                                prefix: "/"
                                grpc: {}
                              route:
                                cluster: upstream-api-service
                    http_filters:
                      - name: envoy.router
                        typed_config: {}
      clusters:
        - name: upstream-api-service
          connect_timeout: 0.250s
          type: static
          load_assignment:
            cluster_name: upstream-api-service-cluster
            endpoints:
              lb_endpoints:
                - endpoint:
                    address:
                      socket_address:
                        address: 
                        port_value: 50001
    admin:
      access_log_path: "/dev/stdout"
      address:
        socket_address:
          address: 0.0.0.0
          port_value: 8001