1  if RUBY_VERSION >= '1.9'
   2    require 'uri'
   3 
   4    str = "\xE6\x97\xA5\xE6\x9C\xAC\xE8\xAA\x9E" # Ni-ho-nn-go in UTF-8, means Japanese.
   5    str.force_encoding(Encoding::UTF_8) if str.respond_to?(:force_encoding)
   6 
   7    unless str == URI.unescape(URI.escape(str))
   8      URI::Parser.class_eval do
   9        remove_method :unescape
  10        def unescape(str, escaped = @regexp[:ESCAPED])
  11          enc = (str.encoding == Encoding::US_ASCII) ? Encoding::UTF_8 : str.encoding
  12          str.gsub(escaped) { [$&[1, 2].hex].pack('C') }.force_encoding(enc)
  13        end
  14      end
  15    end
  16  end