# File lib/httpauth/digest.rb, line 259
      def method_missing(m, *a)
        if ((m.to_s =~ /^(.*)=$/) == 0) and @h.keys.include?($1.intern)
          @h[$1.intern] = a[0]
        elsif @h.keys.include? m
          @h[m]
        else
          raise NameError.new("undefined method `#{m}' for #{self}")
        end
      end