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in the ContentNegotiation source there is a comment saying `// Respond with "415 Unsupported Media Type" if content cannot be transformed on receive`  but when i send a json body to my server where one field name is misspelled, I get a 500 internal server error reply instead.

it seems 415 is only for unsupported content types. ktor should throw a 400 instead. i think jackson should throw a `CannotTransformContentToTypeException`  but that one is internal. or it could subclass ContentTransformationException and throw that. ContentTransformationException could maybe have a field for the http status code that should be returned.

<https://github.com/ktorio/ktor/pull/2242>