The built-in error handler over-assumes json request type

[passionate-bram]

Environment

Affects latest version of nitro, the project I am working on has nitropack@2.7.2.

Reproduction

Stackblitz minimal example

Describe the bug

Preconditions:

• An error occurs during request handling (e.g. throw createError({statusCode:500,statusMessage:'SomeError'}))
• The default nitro error handler is used.
• The request is made with the Fetch API; but really: the request has sec-fetch-mode set to cors.

Then the request over-assumes that the request is JSON, and sending an Accept header set to text/html does not coerce the response to HTML, it remains JSON.

Additional context

The related check in isJsonRequest

Logs

Not relevant