Subscription Proxy

To subscribe to notifications in a production environment, you must provide a callback URL with a valid SSL certificate to handle the notification. For development purposes, you can use a subscription proxy server provided by Google that forwards notifications to a non-SSL callback URL.

Warning: Do not use the subscription proxy server in a production environment. It is less secure and only for development purposes.

To use the subscription proxy, append your non-SSL callback URL to the proxy server's forwarding URL like this:

https://mirrornotifications.appspot.com/forward?url=<your_callback_url>

When you subscribe to a notification, specify the full URL that includes the forwarding service URL and your callback URL. For example:

POST /mirror/v1/subscriptions HTTP/1.1
Authorization: Bearer auth token
Content-Type: application/json
Content-Length: length

{
  "collection": "timeline"
  "userToken": "harold_penguin",
  "operation": ["UPDATE"],
  "callbackUrl": "https://mirrornotifications.appspot.com/forward?url=http://example.com/notify/callback"
}