diff --git a/scripts/autoserve.py b/scripts/autoserve.py
index ed1fb51..87d6b41 100644
--- a/scripts/autoserve.py
+++ b/scripts/autoserve.py
@@ -55,16 +55,24 @@ class Server(http.server.SimpleHTTPRequestHandler):
                 time.sleep(SLEEP_TIME)
             return
 
+        path = self.path
+        if path.strip('/') == '':
+            path = '/index.html'
+        if os.path.isdir(path.strip('/')):
+            if path.endswith('/'):
+                path = path.strip('/') + '/index.html'
+            else:
+                # Redirect to + /
+                self.send_response(301)
+                self.send_header('Location', path + '/')
+                self.end_headers()
+                return
+
         # send 200 response
         self.send_response(200)
         # send response headers
         self.end_headers()
 
-        path = self.path
-        if path.strip('/') == '':
-            path = '/index.html'
-        if os.path.isdir(path.strip('/')):
-            path = path.strip('/') + '/index.html'
         with open(path.strip('/'), 'rb') as f:
             # send the body of the response
             self.wfile.write(f.read())