Unwrap the SERVFAIL

Cloudflare recently released an update to its Cloudflare Resolver, adding "Extended DNS Errors" (EDE) alongside response codes under certain circumstances. This feature aims to assist users in tracing DNS resolution errors and understanding the underlying issues. The EDE provides additional information about the error without altering existing response codes, ensuring backward compatibility. Extended DNS Errors is supported by Google's DoH JSON API and has been implemented in Cloudflare's 1.1.1.1 service.

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