# File lib_wpm/wpm.rb, line 400
    def escapeURL(raw_string)
      url_string = raw_string.gsub(/[^ _0-9A-Za-z.-]/) {|special|
        special.unpack('C*').map{|c|
          format('%%%02X', c)
        }.join
      }
      url_string.gsub!(/ /, '+')
      url_string
    end