diff --git a/debug_rewrite.js b/debug_rewrite.js
new file mode 100644
index 0000000..efe7bf4
--- /dev/null
+++ b/debug_rewrite.js
@@ -0,0 +1,44 @@
+const express = require('express');
+const app = express();
+
+// Simulate our auth middleware (mounted at /api like the real one)
+app.use('/api', (req, res, next) => {
+    console.log('[auth] req.url:', req.url, 'req.path:', req.path);
+    next();
+});
+
+// Our rewrite middleware (no mount path)
+app.use((req, res, next) => {
+    console.log('[rewrite_before] req.url:', req.url, 'req.path:', req.path, 'req.originalUrl:', req.originalUrl);
+    if (req.url.startsWith('/api/sre')) {
+        req.url = '/api' + req.url.slice(9);
+        console.log('[rewrite_after]  req.url:', req.url, 'req.path:', req.path);
+    }
+    next();
+});
+
+// Route handler
+app.get('/api/info', (req, res) => {
+    console.log('[handler] req.url:', req.url, 'req.path:', req.path);
+    res.json({ ok: true, url: req.url, path: req.path });
+});
+
+// 404 handler
+app.use((req, res) => {
+    console.log('[404] req.url:', req.url, 'req.path:', req.path);
+    res.status(404).json({ error: 'not found' });
+});
+
+app.listen(6001, () => {
+    console.log('Listening on 6001');
+    // Make a test request to ourselves
+    const http = require('http');
+    http.get('http://127.0.0.1:6001/api/sre/info', (res) => {
+        let data = '';
+        res.on('data', c => data += c);
+        res.on('end', () => {
+            console.log('Response:', data);
+            process.exit(0);
+        });
+    });
+});