Problem

During a third-party penetration test, X-Matched-Path was flagged as an information disclosure issue. It exposes internal routing structure (e.g., /admin, /api/chat) on every response, which gives attackers a free map of the application’s route surface.

What I've Tried

I attempted two approaches to remove it:

1. Middleware headers.delete('X-Matched-Path') — header still present. Vercel’s edge layer injects it after middleware executes.
2. next.config.ts async headers() override — setting it to an empty string. Vercel’s value still wins.

Request

Vercel support confirmed this is a platform-level header with no config flag or project setting to suppress it, unlike X-Powered-By which has poweredByHeader: false in Next.js.

Add a project-level setting or vercel.json option to suppress platform headers like X-Matched-Path, similar to how Next.js allows poweredByHeader: false. Ideally a general mechanism for opting out of any non-essential platform headers.

Thanks!