Support `application/dns-json+json` and/or `application/dns+json` as aliases for `application/dns-json`


#1

Right now, a query for https://cloudflare-dns.com/dns-query?ct=application/dns-json+json or https://cloudflare-dns.com/dns-query?ct=application/dns+json returns 415 Unsupported Media Type, and only https://cloudflare-dns.com/dns-query?ct=application/dns-json returns 200 OK with a JSON payload, but a non‑JSON Media Type.

application/dns-json is unsupported by most JSON utilities, whereas application/dns-json+json and application/dns+json are, as their Media Type suffix is +json and they’re therefore considered to be JSON Media Types.

I propose to add support for application/dns-json+json and/or application/dns+json as aliases for application/dns-json.