Which server URL is hit when sending WNS and APNS push notification (PushSharp library)

Question

I am using PushSharp library to send push notifications and notifications are working but I do not understand which URL WNS and APNS are using to send push notification . Can anybody help me to find what URL is actually hit to send push notification in case of WNS(PushSharp.Windows) and APNS(PushSharp.Apple).

Like GCM using following URL to send notification:

https://gcm-http.googleapis.com/gcm/send

I am looking for the URL that is being used by WNS and APNS to send push notification. Thanks.