Next js Proxy documentation

/** 
Next.js 16+ (Proxy)
Next.js 16 replaces "middleware" with "proxy". You can use the Node.js runtime for full session validation with database checks:
*/
proxy.ts

import { NextRequest, NextResponse } from "next/server";
import { headers } from "next/headers";
import { auth } from "@/lib/auth";
export async function proxy(request: NextRequest) {
    const session = await auth.api.getSession({
        headers: await headers()
    })
    // THIS IS NOT SECURE!
    // This is the recommended approach to optimistically redirect users
    // We recommend handling auth checks in each page/route
    if(!session) {
        return NextResponse.redirect(new URL("/sign-in", request.url));
    }
    return NextResponse.next();
}
export const config = {
  matcher: ["/dashboard"], // Specify the routes the middleware applies to
};