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@AndrewBarba AndrewBarba released this 10 Oct 16:32
· 12 commits to main since this release
0.2.0
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Learn about vigilant mode.

Any Swift server that listens on a port now runs on Vercel unchanged, with no framework adapters.
This is how Vercel runs standalone Go servers.

  • VercelBootstrap (new): the function's entrypoint. It starts your app with PORT set, finds
    the port it listens on (from /proc, so apps that ignore PORT work too), and proxies requests
    to it. It also implements the Vercel runtime protocol for the app: health checks, internal
    header stripping, an end per request (and at 101 for WebSockets), streaming in both
    directions with backpressure, WebSocket tunnels, CRON_SECRET enforcement on cron paths,
    SIGTERM forwarding, and crash reporting. Built and deployed by vercel-build.
  • VercelBuildPlugin: builds both binaries and writes vercel-bootstrap.json; the function's
    handler, executable, is now the bootstrap, like Vercel's Go builder. Executable products named
    executable or bootstrap are rejected (AWS Lambda would run a file named bootstrap as its
    runtime, bypassing Vercel's).
  • VercelRuntime is now optional and framework-agnostic. Per-request logs and waitUntil take the
    request's HTTPFields: Vercel.withRequest(request.headers) { ... } (typically from a
    five-line middleware) and Vercel.waitUntil(for: request.headers) { ... }. They talk to the
    bootstrap over VERCEL_BOOTSTRAP_SOCKET, connecting on first use. Request helpers are
    request.headers.vercel.
  • The package now requires macOS 15 instead of macOS 26.2 (Vapor 5 still requires macOS 26.2).

Breaking changes

  • Removed VercelVapor, VercelHummingbird and VercelHummingbirdWebSocket. Use
    Application() / Application(router:) and .http1WebSocketUpgrade directly.
  • Removed VercelCronMiddleware: the bootstrap enforces CRON_SECRET on the cron paths from
    vercel.json. VercelCron.isAuthorized(_:secret:) remains for other routes.
  • Removed the in-process runtime API (VercelRuntime class, serverStarted, withRequest(_:)
    with an InvocationContext, removeVercelInternalFields): the bootstrap owns the runtime
    protocol now.
  • request.vercel is now request.headers.vercel.
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