test headers

apps/public/app/api/headers/route.ts

@@ -0,0 +1,29 @@
+import { NextResponse } from 'next/server';
+
+const IP_HEADER_ORDER = [
+  'cf-connecting-ip',
+  'true-client-ip',
+  'x-vercel-forwarded-for', // Vercel-specific, most reliable on Vercel
+  'x-forwarded-for', // Standard proxy header (first IP in chain)
+  'x-real-ip', // Alternative header
+  'x-client-ip',
+  'fastly-client-ip',
+  'do-connecting-ip',
+  'x-cluster-client-ip',
+];
+
+export const GET = function POST(req: Request) {
+  return NextResponse.json({
+    headers: Object.fromEntries(req.headers),
+    ips: IP_HEADER_ORDER.reduce(
+      (acc, header) => {
+        const value = req.headers.get(header);
+        if (value) {
+          acc[header] = value;
+        }
+        return acc;
+      },
+      {} as Record<string, string>,
+    ),
+  });
+};