Hey there! Let's break down your questions about Google Drive API notifications clearly:

Unfortunately, Google Drive API does not support WebSocket-based push notifications right now. The only official push mechanism available is the webhook-style setup via the changes/watch endpoint, which sends HTTP POST requests to a specified endpoint whenever changes occur.

If webhooks don't fit your use case, your fallback option would be periodic polling using the changes.list endpoint. You can optimize this by storing the latest pageToken from each request and filtering results with the changedTime parameter to only fetch updates since your last check—this cuts down on unnecessary data transfer and API calls.

You’re right that the official docs don’t explicitly enumerate the allowed values for the type parameter, but from real-world usage and community discussions, the only supported (and practical) value is web_hook.

This parameter defines the transport method for the notification, and as of now, Google Drive API only implements webhook-based delivery for this endpoint. Any other values are either unimplemented, restricted to internal use, or in early testing—so sticking with web_hook is the way to go for production setups.

内容的提问来源于stack exchange，提问作者Joe Quigley