Python projects now support routing rules

Python projects can now use routing rules to set response headers or rewrite requests to internal paths, including apps built with FastAPI, Django, and Flask.

The Vercel CDN evaluates rules before requests reach your application, so changes apply without a new deployment.

For example, this FastAPI app serves a /new route:

from fastapi import FastAPI

app = FastAPI()

@app.get("/new")
def new_route() -> dict[str, str]:
    return {"message": "New route!"}

To send requests for /old to that route, create a rewrite from the CDN tab in your project dashboard or with the Vercel CLI:

# Add a rewrite (staged automatically)
vercel routes add --ai "Rewrite /old to /new" --yes

# Review staged changes
vercel routes list --diff

# Publish to production
vercel routes publish

Published rules take effect immediately across all regions, and you can roll back to a previous version from the History tab.

You can also manage rules from Python with the vercel SDK, which wraps the Vercel REST API. add_route stages the rule, and update_route_version publishes it:

from vercel.client import Vercel
from vercel.project_routes import RewriteRoute

vercel = Vercel(access_token="...")

added = vercel.project_routes.add_route(
    project_id="prj_123",
    route=RewriteRoute(name="Rewrite /old to /new", source="/old", destination="/new"),