chore(debug): output request headers in function

app/api/web/check-headers/route.ts

@@ -0,0 +1,7 @@
+import { NextResponse } from "next/server"
+
+import type { NextRequest } from "next/server"
+
+export async function GET(request: NextRequest) {
+  return NextResponse.json(Object.fromEntries(request.headers.entries()))
+}