diff --git a/server.js b/server.js
index eab79a5..dd2450a 100644
--- a/server.js
+++ b/server.js
@@ -35,6 +35,11 @@ const serveFile = async (filePath, contentType, response) => {
 }
 
 const server = http.createServer((req, res) => {
+    if (path.normalize(decodeURI(req.url)) !== decodeURI(req.url)) {
+        res.statusCode = 403;
+        res.end();
+        return;
+    }
     console.log(req.url, req.method);
     myEmitter.emit('log', `${req.url}\t${req.method}`, 'reqLog.txt');