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由 Alexey Mahotkin 提交于
http://www.faqs.org/rfcs/rfc2045.html says: may be represented by an "=" followed by a two digit hexadecimal representation of the octet's value. The digits of the hexadecimal alphabet, for this purpose, are "0123456789ABCDEF". Uppercase letters must be used; lowercase letters are not allowed. ActionMailer, however, used "=%02x" specification. Signed-off-by: NDavid Heinemeier Hansson <david@loudthinking.com>
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