http_header:http_update

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Predicate http_update_encoding/3

http_update_encoding(+HeaderIn, -Encoding, -HeaderOut): Allow for rewrite of the header, adjusting the encoding. We distinguish three options. If the user announces `text', we always use UTF-8 encoding. If the user announces charset=utf-8 we use UTF-8 and otherwise we use octet (raw) encoding. Alternatively we could dynamically choose for ASCII, ISO-Latin-1 or UTF-8.