Didn't find a registered implementation for 'envoy.filters.http.grpc_web error with 1.22 but not 1.21

[Jiajun Yang]

Hi,
I have project that run envoy for grpc_web on Ubuntu.
With 1.21 and below my envoy.yaml config works just fine but in 1.22 it produced:

`Didn't find a registered implementation for 'envoy.filters.http.grpc_web' with type URL: ''`

Even though envoy.filters.http.grpc_web is an option based on the log:
```

[2022-05-23 14:46:59.732][123][info][main] [source/server/server.cc:394] envoy.filters.http: envoy.bandwidth_limit, envoy.buffer, envoy.cors, envoy.csrf, envoy.ext_authz, envoy.ext_proc, envoy.fault, envoy.filters.http.adaptive_concurrency, envoy.filters.http.admission_control, envoy.filters.http.alternate_protocols_cache, envoy.filters.http.aws_lambda, envoy.filters.http.aws_request_signing, envoy.filters.http.bandwidth_limit, envoy.filters.http.buffer, envoy.filters.http.cache, envoy.filters.http.cdn_loop, envoy.filters.http.composite, envoy.filters.http.compressor, envoy.filters.http.cors, envoy.filters.http.csrf, envoy.filters.http.decompressor, envoy.filters.http.dynamic_forward_proxy, envoy.filters.http.dynamo, envoy.filters.http.ext_authz, envoy.filters.http.ext_proc, envoy.filters.http.fault, envoy.filters.http.gcp_authn, envoy.filters.http.grpc_http1_bridge, envoy.filters.http.grpc_http1_reverse_bridge, envoy.filters.http.grpc_json_transcoder, envoy.filters.http.grpc_stats, envoy.filters.http.grpc_web, envoy.filters.http.header_to_metadata, envoy.filters.http.health_check, envoy.filters.http.ip_tagging, envoy.filters.http.jwt_authn, envoy.filters.http.local_ratelimit, envoy.filters.http.lua, envoy.filters.http.oauth2, envoy.filters.http.on_demand, envoy.filters.http.original_src, envoy.filters.http.ratelimit, envoy.filters.http.rbac, envoy.filters.http.router, envoy.filters.http.set_metadata, envoy.filters.http.stateful_session, envoy.filters.http.tap, envoy.filters.http.wasm, envoy.grpc_http1_bridge, envoy.grpc_json_transcoder, envoy.grpc_web, envoy.health_check, envoy.http_dynamo_filter, envoy.ip_tagging, envoy.local_rate_limit, envoy.lua, envoy.rate_limit, envoy.router, match-wrapper

```

Here is my config

```

admin:
  address:
    socket_address:
      address: 0.0.0.0
      port_value: 9901
      protocol: TCP

static_resources:
  listeners:
  - name: listener_0
    address:
      socket_address: { address: 0.0.0.0, port_value: 8081 }
    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: ingress_http
          codec_type: auto
          route_config:
            name: local_route
            virtual_hosts:
            - name: local_service
              domains: ["*"]
              routes:
              - match: { prefix: "/" }
                route:
                  cluster: monosphere
                  timeout: 0s
                  max_stream_duration:
                    grpc_timeout_header_max: 0s
              cors:
                allow_origin_string_match:
                - prefix: "*"
                allow_methods: GET, PUT, DELETE, POST, OPTIONS
                allow_headers: keep-alive,user-agent,cache-control,content-type,content-transfer-encoding,custom-header-1,x-accept-content-transfer-encoding,x-accept-response-streaming,x-user-agent,x-grpc-web,grpc-timeout
                max_age: "1728000"
                expose_headers: custom-header-1,grpc-status,grpc-message
          http_filters:
            - name: envoy.filters.http.grpc_web
            - name: envoy.filters.http.cors
            - name: envoy.filters.http.router
          stream_idle_timeout: 0s


  clusters:
  - name: monosphere
    connect_timeout: 0.25s
    type: logical_dns
    http2_protocol_options: {}
    lb_policy: round_robin
    load_assignment:
      cluster_name: monosphere
      endpoints:
        - lb_endpoints:
            - endpoint:
                address:
                  socket_address:
                    address: 0.0.0.0
                    port_value: 8082

```

Please advice what needs to be changed for 1.22 to work ? Much appreciated.

[Stephan Zuercher]

See the release notes:

• config: type URL is used to lookup extensions regardless of the name field. This may cause problems for empty filter configurations or mis-matched protobuf as the typed configurations. This behavioral change can be temporarily reverted by setting runtime guard envoy.reloadable_features.no_extension_lookup_by_name to false.

You can use that runtime flag to reinstate the old behavior, but when the flag is removed, you'll need to declared the typed config for your https filters (in the same way that you've done for the HttpConnectionManager network filter). Something like:

http_filters:

  - name:  envoy.filters.http.grpc_web_but_can_be_anything

    typed_config:

      "@type": type.googleapis.com/envoy.extensions.filters.http.grpc_web.v3.GrpcWeb

This applies to the other http filters in your config as well as any other extenions. See the documentation for each extension's config object to learn the correct type name.

Stephan

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[Jiajun Yang]

Can you show me how to set this runtime flag in the config yaml file? It is really not clear to me how to do it .