您正在请求 HTTPS 资源，因此您的 GET 请求需要使用 SSL 加密.

You're requesting an HTTPS resource, so your GET request needs to use SSL encryption.

http://ruby-doc.org/stdlib-1.9.3/libdoc/net/http/rdoc/Net/HTTP.html#method-i-use_ssl-3F

所以你的最后一行应该是这样的:

So your last line should look like:

  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = true
  http.verify_mode = OpenSSL::SSL::VERIFY_NONE # You should use VERIFY_PEER in production
  request = Net::HTTP::Get.new(uri.request_uri)
  res = http.request(request)