AWS EC2 load balancer rule to redirect if query parameter is missing

Question

Is there a way/syntax to redirect calls with an AWS ELB rule if a certain query parameter is missing?

I couldn't find anything related to empty query parameters in the docs https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-listeners.html#query-string-conditions.

My use case would be to redirect back to app front page if e.g. query param id is empty.

Answer 1

You can use a wildcard * to match all values. Hence, you can configure a rule with id query string and * as value, to catch requests with id parameter.

Then in the default route, forward to your app front page.