envoy.yaml

admin:
  access_log_path: /tmp/admin_access.log
  address:
    socket_address:
      address: 0.0.0.0
      port_value: 9901
static_resources:
  listeners:
    - name: listener_0
      address:
        socket_address: { address: 0.0.0.0, port_value: 8080 }
      filter_chains:
        - filters:
            - name: envoy.filters.network.http_connection_manager
              typed_config:
                "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
                stat_prefix: grpc_proxy
                codec_type: AUTO
                route_config:
                  name: local_route
                  virtual_hosts:
                    - name: grpc_host
                      domains: [ "*" ]
                      routes:
                        - match: { prefix: "/" }
                          route:
                            cluster: grpc_service
                            timeout: 0s
                      cors:
                        allow_origin_string_match:
                          - safe_regex:
                              google_re2: {}
                              regex: "^https?://.*:3000$"  # Adjust origin as needed
                        allow_methods: "GET, POST, OPTIONS"
                        allow_headers: "x-user-agent, x-grpc-web, content-type"  # Add custom headers here
                        expose_headers: "x-custom-header"
                        max_age: "3600"
                        allow_credentials: true
                http_filters:
                  - name: envoy.filters.http.grpc_web  # Add gRPC-Web support
                    typed_config:
                      "@type": type.googleapis.com/envoy.extensions.filters.http.grpc_web.v3.GrpcWeb
                  - name: envoy.filters.http.cors
                    typed_config:
                      "@type": type.googleapis.com/envoy.extensions.filters.http.cors.v3.Cors
                  - name: envoy.filters.http.router
                    typed_config:
                      "@type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
  clusters:
    - name: grpc_service
      connect_timeout: 0.25s
      type: LOGICAL_DNS
      http2_protocol_options: { }
      lb_policy: ROUND_ROBIN
      load_assignment:
        cluster_name: grpc_service
        endpoints:
          - lb_endpoints:
              - endpoint:
                  address:
                    socket_address: { address: server, port_value: 50051 }