HTTP Task cannot call localhost

[almen-wong]

I use the emulator to create HTTP Task
The task is able to GET https://www.google.com, but when I GET http://localhost:8000 the task will fail
Response: UNKNOWN(2): HTTP status code -1

this is how I setup the emulator

docker-compose.yml

  gcloud-tasks-emulator:
    container_name: gcloud-tasks
    image: ghcr.io/aertje/cloud-tasks-emulator:latest
    command: -host 0.0.0.0 -port 8123 -queue "projects/mysandbox/locations/asia-east1/queues/test"
    ports:
      - "${TASKS_PORT:-8123}:8123"

and this is how i create the task

    const client = new CloudTasksClient({
      port: 8123,
      servicePath: "localhost",
      sslCreds: credentials.createInsecure(),
    })

    const parent = client.queuePath(
      "mysandbox",
      "asia-east1",
      "test"
    )
    const task = {
      httpRequest: {
        httpMethod: "GET",
        url: "http://localhost:8000",
      }
    }
   const request = { parent, task }
   await client.createTask(request)

any ideas why I cannot call the localhost? I can call http://localhost:8000 directly.

[Aert van de Hulsbeek]

Hi @almen-wong,

You can either start the container's network in host mode if you're using linux (add network_mode: host in the docker compose) or you can access the host on host.docker.internal (instead of using localhost).

A quick google of "call localhost from docker container" would've given you this useful SO answer.

Hope that helps, cheers.

[almen-wong]

Thanks for your help @aertje

However, when I changed to host.docker.internal, i will have the error connection refused
seems like the host refuses to allow the docker container to connect
Do you know how to solve it?

[Aert van de Hulsbeek]

Hope you resolved the issue @almen-wong. Closing this ticket as this is not a problem with the emulator.