PHP scripts require PHP engine to process them. Otherwise you'll just get the source code outputted
PHP scripts require PHP engine to process them. Otherwise you'll just get the source code outputted as plain text in most web servers.

_acme-challenge label for e.g. Let's Encrypt validations, then their set up with any other provider trying to issue certificates (and depending on the same DNS record label for that) may cause them to break the set up with you, when they are trying to fix the issuance problem they're ending up with on their other provider, and vice versa._acme-challenge CNAME._acme-challenge to be pointed via CNAME to them, others are requesting it to be done through NS records, but using the DNS records that way always come with that Catch-22 / caveat - fixing it for the one provider, but braking it for the other.

http-echo-server on npm iircnpx http-echo-server