def post(url, params)
    url = URI.parse(url.to_s) unless url.is_a?(URI)
    req = Net::HTTP::Post.new(url.path)
    req.form_data = params
    http = Net::HTTP.new(url.host, url.port)
    main = self
    http.instance_eval do
      @debug_output = $stderr if main.params['debug'].given?
      http.use_ssl = true
      @ssl_context = OpenSSL::SSL::SSLContext.new
      @ssl_context.verify_mode = OpenSSL::SSL::VERIFY_NONE
    end
    http.start{|http| http.request(req)}
  end