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Hostheader indicates either a client error / bug, a DNS error, or a malicious request. It's perfectly reasonable to return HTTP 400 (with no CORS headers) in that case, or even just close the connection without responding at all. A legit client might try connecting by IP rather than hostname, but this is essentially never done for HTTPS (it'll result in cert errors) and in any case doesn't work on multi-tenant servers, so it's generally fine to not support this case. That's especially true when the only expected client is running your own code!