Handle empty or falsy charset in response

[kanongil]

This way it's possible to explicitly remove the charset from the response which can be valid for some use-cases.

[hueniverse]

Why?

[kanongil]

@hueniverse Personally I would like to serve text/vtt files, and I was surprised to find that a charset was added to the header. From the standard text/vtt files are required to have utf-8 encoding, thus the charset indicator would only help clients that parse it as plain text which I don't expect to ever have.

[kanongil]

Any update on this?

Also, https://tools.ietf.org/html/rfc6838#section-4.2.1 states that the charset "SHOULD NOT" be specified for text content where the charset is already transported in the payload.

[lock]

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