A Python gatekeeper in front of your app, with no changes to its code

The short version: Vercel announced that Routing Middleware, a layer that runs in front of your app, now supports Python. You can write it for FastAPI, Flask, Django and other frameworks.

What changed

• In vercel.toml you add a [proxy] table with entrypoint set to proxy:proxy, meaning a proxy object in proxy.py.
• The middleware is an ASGI or WSGI app that runs separately from your main app.
• It can only use packages from the vercel.proxy dependency group in pyproject.toml; you install the helpers with uv add --group vercel.proxy vercel-proxy.
• The announcement’s example: /old-blog/{slug} returns a 308 redirect to /blog/{slug}, and /api/{path:path} passes traffic on and adds the header x-api-version: 2. Unmatched requests continue to the app unchanged.

What is missing

The announcement does not give availability by plan, pricing, time limits or supported Python versions, and it does not say whether this is a beta. The configuration snippet is labelled JSON but written in TOML, so follow the documentation.

How to read this

This is the vendor describing its own feature. Since it runs as a separate app with its own dependency group, remember to add every imported package to vercel.proxy. More on working with Python in AI is in the Python and SDKs hub.

Sources

Routing Middleware now supports PythonVercel · Oct 22, 2026 · Primary sourceVercel ChangelogVercel · Oct 22, 2026