zlacker

>>aendru+(OP)
This is a terrible implementation of domain verification. dns-01 and http-01 are more or less standardized at this point. Use them, and don't roll your own. Reference: https://letsencrypt.org/docs/challenge-types/.

>>paxys+x4
I don't get http-based verification in general. If you want to really prove someone owns a domain, make them change an authoritative DNS record. Everything else feels like it is begging for edge cases to crop up. Why should my social media or SSL certificate vendor care about my web servers?

>>bob102+S9
DNS challenge is required for wildcards on LE at the very least.

But the reason for HTTP is pretty simple - it's extremely easy to implement. You only need to tell your ops to redir a subdomain to your app and you're done, you don't need DNS with API that have narrow enough permission to allow that one team in whole company to generate ACME stuff; most providers ACLs on DNS end at "this client have acesss to that domain via API".