GCP Cloud Run Service configuration guide to Internal HTTP Requests from Another Service
I'm experiencing an scenario where my Cloud Run service, which is built with Flask and deployed using a Docker container, fails to respond to internal HTTP requests from another Cloud Run service. Both services are in the same region and project, and I've confirmed that they're on the same VPC. I have set up the necessary IAM roles for the service accounts. Here’s a snippet of the request I’m making: ```python import requests def trigger_service_b(): url = 'https://service-b-xyz-uc.a.run.app/api/trigger' # Service B URL response = requests.get(url) print(response.status_code, response.text) ``` When I execute this code, I receive a `403 Forbidden` behavior. I’ve granted the service account associated with service A the `Cloud Run Invoker` role for service B. I’ve also double-checked the URL and confirmed it’s correct. I've tried using `curl` from within the container of service A to hit the endpoint directly, and I get the same `403 Forbidden` response. I thought it might be an authentication scenario, but I verified the service account's permissions and they seem fine. Additionally, I checked the logs for service B, and there’s no indication it even receives the request. I’m also using the `gcloud` command-line tool to deploy my services: ```bash gcloud run deploy service-a --image gcr.io/my-project/service-a --platform managed --allow-unauthenticated ``` I tried changing the `--allow-unauthenticated` flag to `false`, but that caused a different `401 Unauthorized` behavior when attempting to access the service. I’m not sure what I’m missing here. Any guidance would be appreciated!