Executive Summary
Vercel has announced native support for WebSocket connections within its Serverless Functions, enabling persistent, bidirectional communication for real-time applications. This feature is aimed at developers building interactive services like AI streaming, chat, and collaborative tools. The new capability integrates with Vercel's "Active CPU pricing," ensuring users are only billed for active processing time, not for idle connection periods.
Key Takeaways
* New Capability: Vercel Functions can now establish and serve WebSocket connections.
* Primary Use Cases: Intended for real-time features such as interactive AI streaming, live chat, and collaborative applications.
* Pricing Model: Billed under "Active CPU pricing," which only charges for the time a function spends processing messages, not for maintaining an idle connection.
* Compatibility: Works with standard Node.js libraries like `ws` and higher-level ones like `Socket.IO` without requiring additional configuration.
* Infrastructure: WebSocket connections run on Vercel's "Fluid compute" and adhere to the same limits and pricing as other Function invocations.
Strategic Importance
This update makes Vercel a more viable platform for building stateful, real-time applications, reducing developer reliance on third-party services for WebSocket functionality.