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See #2551
I used the example code posted by @pzolo85 and made some modifications, mainly the Accept header feature.
This middleware will check if the Content-Type of an incoming request matches a list of allowed values.
In addition, it will modify the Accept field of the response's header with the allowed content types.
Could be useful in telling API client's how the request should be sent and preventing invalid data formats from being sent to the server.