diff --git a/bin/server.js b/bin/server.js
index 6a6d7a6..aad10ef 100644
--- a/bin/server.js
+++ b/bin/server.js
@@ -76,13 +76,13 @@ class Server {
 
       // URL normalization middleware - collapse multiple slashes
       app.use((req, res, next) => {
-        if (req.path && req.path.includes('//')) {
+        if (req.url && req.url.includes('//')) {
+          // Split URL into path and query string
+          const [path, queryString] = req.url.split('?')
           // Collapse multiple consecutive slashes into a single slash
-          const normalizedPath = req.path.replace(/\/+/g, '/')
-          // Reconstruct req.url with normalized path
-          const queryString = req.url.includes('?') ? req.url.substring(req.url.indexOf('?')) : ''
-          req.url = normalizedPath + queryString
-          req.path = normalizedPath
+          const normalizedPath = path.replace(/\/+/g, '/')
+          // Reconstruct req.url with normalized path (req.path is read-only and will auto-update)
+          req.url = queryString ? `${normalizedPath}?${queryString}` : normalizedPath
         }
         next()
       })