Just a quick question regarding how On-Demand TLS ask renews certs, does it use the same url to see if it is still valid or is there anything else I should be doing, this is for a custom saas application that users can add their own domain.
Thanks
All it does is Caddy will make an HTTP GET request to that URL with ?domain=example.com in the query string before renewing or obtaining (same thing, really) any certificate on-demand; and if the response is 200 OK, then it will be allowed. Very simple. 
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