Have other mechanisms for obtaining document status been considered besides polling (e.g., WebSocket or Server-Sent Events)?

Yes, besides polling, there are more efficient mechanisms for receiving document status updates, such as WebSocket and Server-Sent Events (SSE).

• WebSocket — a bidirectional communication channel between the client and server, allowing the server to send updates to the client at any time without the need for constant requests.

• Server-Sent Events (SSE) — a one-way channel from the server to the client, where the server can send events in real-time.

Using these technologies can reduce the load on the server and network, decrease delays in receiving updates, and improve application responsiveness. However, the choice depends on architecture requirements, supported protocols, and infrastructure.