🐛 Bug Report — Runtime APIs "application/dns-json" not detected as text body

[zecanard]

I am trying to using the API to query the Cloudflare DNS, but it returns a MIME type of application/dns-json, which throws the warning:

Called .text() on an HTTP body which does not appear to be text. The body's Content-Type is "application/dns-json". The result will probably be corrupted. Consider checking the Content-Type header before interpreting entities as text.

Looking at:

workerd/src/workerd/util/mimetype.c++

Line 397 in 0e4d887

(subtype == "json" || subtype.endsWith("+json"));

Should the line be changed to simply subtype.includes("json")? Not sure of possible implications vs endsWith(), as previously suggested.

This is a continuation of #528. Apologies if I should have commented on that one instead of opening a new Issue.