diff --git a/etc/mitm_cors.py b/etc/mitm_cors.py
index 7353290..5cdae7b 100644
--- a/etc/mitm_cors.py
+++ b/etc/mitm_cors.py
@@ -32,5 +32,7 @@ def request(flow: flow.Flow):
 			"Access-Control-Allow-Origin": allowed_origin(original_origin),
 			"Access-Control-Allow-Methods": "GET,POST",
 			"Access-Control-Allow-Headers": ALLOW_HEADERS,
-			"Access-Control-Max-Age": "10"
+			"Access-Control-Max-Age": "86400",
+			"Cache-Control": "public, max-age=86400",
+			"Vary": "origin",
 		})