[semidet,multifile]http:mime_type_encoding(+MimeType,
-Encoding)Encoding is the (default) character encoding for MimeType.
This is used for setting the encoding for HTTP replies after the user
calls
format('Content-type: <MIME type>~n'). This hook is
called before
mime_type_encoding/2. This default defines utf8
for JSON and Turtle derived application/ MIME types.