DNS TXT challenge verification

[schoen]

@rmbolger

I’ve longed for a REST service that exists purely to check TXT record values from clients. It could be as simple as a GET method that takes an FQDN and TXT value and returns either HTTP 200 if it exists or HTTP 404 if it doesn’t like this:

I imagine that @JuergenAuer might be willing to create something like this because it seems somewhat related to his existing testing tools.