Bug Behavior of Accept-Header not rfc7231 compliant?

[ForumGeek]

Hi,

when using the somewhat exotic but not forbidden Accept header

Code:

Accept: */*, image/avif

on a text/html output (for example the forum homepage) Xenforo produces a 406 error.

This is not the case when using either
Code:

Accept: */*, text/html, image/avif
or
Code:

Accept: */*
which both return a 200 code as expected.

I can understand that the header combination "Accept: /, image/avif" implies that an image is expected, however referring to RFC 7231 the wildcard...

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