Vercel functions
Use Backfire from Vercel functions and route handlers
A Vercel function is an ephemeral process with an open outbound network. Backfire gives those invocations one authenticated egress path, so a URL that arrived in a request body is never handed straight to fetch().
What to expect
- Works in both the Node.js and Edge runtimes — it is a plain HTTPS POST with a JSON body.
- Keep BACKFIRE_KEY in your Vercel environment variables; one key per environment, revocable without a redeploy.
- Timeout ceilings are enforced by the relay, so a slow upstream cannot hold an invocation open.
- Every call is written to your activity log with the target host, status and duration.
Working example
vercel
// app/api/profile/route.ts (Node.js or Edge runtime)
export async function GET(request: Request) {
const upstream = await fetch('https://backfireapi.base44.app/functions/forward', {
method: 'POST',
headers: {
Authorization: `Bearer ${process.env.BACKFIRE_KEY}`,
'Content-Type': 'application/json',
},
body: JSON.stringify({
url: 'https://api.example.com/v1/profile',
method: 'GET',
headers: { Accept: 'application/json' },
timeout_ms: 8000,
}),
});
const envelope = await upstream.json();
if (!envelope.ok) {
return Response.json({ error: envelope.error.code }, { status: 502 });
}
return Response.json(envelope.body.json);
}Other environments
Questions about this
Keep reading
Try it with 5,000 free trips.
No card, no subscription, and the balance never expires.