OIDC w/ charset on content-type fails

[andrewpmartinez]

Experienced
Using content type application/x-www-form-urlencoded;charset=UTF-8 results in the following error: {"code":"UNSUPPORTED_MEDIA_TYPE","message":"the content type: application/x-www-form-urlencoded;charset=UTF-8, is not supported (supported: application/x-www-form-urlencoded, application/json)"}

Expected
Ability to use fully expressive content-type headers.

Reproduction

1. Start OIDC authentication flow
2. POST login w/ content-type w/ charset