# File lib/net/http.rb, line 1426
    def set_form_data(params, sep = '&')
      self.body = params.map {|k,v| "#{urlencode(k.to_s)}=#{urlencode(v.to_s)}" }.join(sep)
      self.content_type = 'application/x-www-form-urlencoded'
    end