Hello, I have an issue while trying to receive a webhook notification from the broker. I start the Docker container for the broker using the following configuration:

pact-broker:
  image: pactfoundation/pact-broker:latest
  ports:
    - "9292:9292"
  depends_on:
    - postgres
  environment:
    PACT_BROKER_PORT: '9292'
    PACT_BROKER_DATABASE_URL: "<postgres://postgres:CHANGE_ME@postgres/postgres>"
    PACT_BROKER_LOG_LEVEL: INFO
    PACT_BROKER_SQL_LOG_LEVEL: DEBUG
    PACT_BROKER_DATABASE_CONNECT_MAX_RETRIES: "5"
    PACT_BROKER_BASE_URL: '<https://localhost> <http://localhost> <http://localhost:9292> <http://pact-broker:9292> <https://host.docker.internal> <http://host.docker.internal> <http://host.docker.internal:9292>'
    PACT_BROKER_BASIC_AUTH_ENABLED: true
    PACT_BROKER_BASIC_AUTH_USERNAME: 'pactBrokerUsername'
    PACT_BROKER_BASIC_AUTH_PASSWORD: 'pactBrokerUserPassword'
    PACT_BROKER_WEBHOOK_SCHEME_WHITELIST: 'https, http'
    PACT_BROKER_WEBHOOK_HOST_WHITELIST: 'localhost'

Then, I start anothe rdocker container with a simple Spring Boot app that accepts POST at http://localhost:9300. I also create a webhook using the following line:

docker run --rm -v ${PWD}:${PWD} --network="host" pactfoundation/pact-cli broker \
create-or-update-webhook <http://localhost:9300/notifications> --uuid "1662acf91d16ed1951da4b67a9ea8f37a844bbe3" \
--request POST --broker-base-url=<http://localhost:9292> \
--broker-username pactBrokerUsername --broker-password pactBrokerUserPassword \
--data '{ "event_type": "provider_verification_failed","client_payload": { "pact_url": "<http://localhost:9292>", "sha": "sha", "branch":"master" , "message": "Provider verification failed!" } }' \
--header 'Content-Type: application/json' 'Accept: application/json' \
--provider "bm" --provider_verification_failed \
--description "Provider verification failed!"

Everything goes smooth until I lead a verification to fail, in which case I can see the webhook retrying with the following error:

[2024-06-27T12:17:35Z] DEBUG: Webhook context {"base_url":"<http://localhost:9292>","build_url":null,"provider_version_tags":["eescp_openapi_gradle"],"event_name":"provider_verification_failed"}
[2024-06-27T12:17:35Z] INFO: HTTP/1.1 POST <http://localhost:9300/notifications>
[2024-06-27T12:17:35Z] INFO: accept: application/json
[2024-06-27T12:17:35Z] INFO: user-agent: Pact Broker v2.110.0
[2024-06-27T12:17:35Z] INFO: content-type: application/json
[2024-06-27T12:17:35Z] INFO: {"event_type":"provider_verification_failed","client_payload":{"pact_url":"<http://localhost:9292>","sha":"sha","branch":"master","message":"Provider verification failed!"}}
[2024-06-27T12:17:35Z] ERROR: Error executing webhook 1662acf91d16ed1951da4b67a9ea8f37a844bbe3 Errno::ECONNREFUSED - Failed to open TCP connection to localhost:9300 (Connection refused - connect(2) for "localhost" port 9300)
[2024-06-27T12:17:35Z] INFO: Retrying webhook in 10 seconds

I cannot figure out why I am getting ECONNREFUSED, the app is running correctly at port 9300 and I can access the endpoint via both Postman and curl. I'll appreciate any help on this...

Are you sure localhost:9300 refers to the same localhost within the docker network the broker is running? I'd need to remind myself of the docker networking options, but on the surface this doesn't look like a pact problem, but rather a docker networking issue. The broker seems to be firing the webhook but it can't connect to the target