LoadBalancerGrpcSuccessCodes

GRPC success codes for load balancer health checks.

| Default value | 12 | | Allowed values | 0-99 |

You can specify multiple values (e.g., 12,13) or a range (e.g., 10-99).

Use Cases

• Adjust when your gRPC services return non-default status codes for healthy responses
• Set to 0 if your gRPC health check endpoint returns OK (status code 0) to indicate health
• Set to a range or comma-separated list when your service may return multiple valid status codes

Additional Information

The default value of 12 corresponds to the gRPC UNIMPLEMENTED status code. This is the default because many services do not implement the gRPC health checking protocol, and the ALB treats UNIMPLEMENTED as a healthy response in that case.

If your service implements the gRPC Health Checking Protocol, you should set this to 0 (the OK status code) to ensure the health check correctly validates your service's health endpoint.

$ convox apps params set LoadBalancerGrpcSuccessCodes=0

See Also

• LoadBalancerSuccessCodes
• LoadBalancerAlgorithm
• Rack Parameters