# File lib/faraday/utils.rb, line 127
    def escape(s)
      s = s.to_s
      s = s.dup.force_encoding('binary') if s.respond_to? :force_encoding
      s.gsub(/([^a-zA-Z0-9_.-]+)/n) do |match|
        '%' << match.unpack('H2'*bytesize(match)).join('%').tap { |c| c.upcase! }
      end
    end