How Does The DDNS "Result Match" Check Work?

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Hey All,

Help me understand this DDNS option. I have made a Custom DDNS client for my provider ChangeIP.com and that’s working great. However, there is an option called “Result Match” that I’m having trouble understand. If I understand it correctly, you can specify what a successful (http?) response looks like and if it doesn’t match, the update fails? For example, if the DDNS provider returns a “200 Successful Update” as my provider does, any response other than that should result in a failure, is that correct?

If my understanding is correct, then maybe it’s broken? When I add some random text as the response check (see pic), it still successfully updates my DDNS, when it should fail. Does this work for any of you?