getaddrinfo: nodename nor servname provided, or not known (SocketError)

[RajOfficeTroops]

The host url that I'm requesting is https://api.push.apple.com/....
The actual url is the push token appended to the above url:

Therefore the actual url becomes https://api.push.apple.com/..../<push_token> which is uri

notification = RubyPushNotifications::APNS::APNSNotification.new tokens, { aps: { alert: 'Hello APNS World!', sound: 'true', badge: 1 } }

pusher = RubyPushNotifications::APNS::APNSPusher.new(File.read('Certificates.pem'), true, password, { host: uri })

On pusher.push [notification] I get getaddrinfo: nodename nor servname provided, or not known (SocketError).

The uri works perfectly via curl.