[Problem Summary] Our Firebase Functions V2 (based on Cloud Run) deployed in asia-northeast3 is failing with an immediate 500 Internal Server Error when sending an outbound HTTPS fetch request to the Google Cloud Vision API (https://vision.googleapis.com).
[Environment Details]
Project ID: (PII Removed by Staff)
Function Name: analyzePetImage
Region: asia-northeast3
Current Settings: Memory 1GiB, IAM Secret Manager Secret Accessor granted.
[Confirmed Diagnostics - Core Evidence]
IAM/Memory Ruled Out: All required permissions are set, and testing with small images (256KB) and high memory (1GiB) still results in failure.
Protocol-Specific Failure:
Requests using the https URL fail (most recently within 55ms) and are caught as a low-level network error (
Fetch 또는 내부 오류 발생).
CRITICAL: When the Vision API URL was temporarily changed to http (for debugging purposes), the immediate block was bypassed, and the function successfully executed the code logic (receiving the expected 400 Bad Request from the API server).
Conclusion: The failure is strictly tied to the https protocol’s outgoing communication at the Cloud Run V2 network layer in the asia-northeast3 region.
[Request to Community] We suspect a hidden firewall rule, TLS/SSL configuration issue, or a specific egress networking policy is blocking the https traffic to Google APIs from this Cloud Run instance. We are unable to create a support case. Are there any known issues or specific Cloud Run configuration steps (VPC/Egress) we may have missed to allow this essential outbound Google API traffic?