diff --git a/web/conf/nginx.conf b/web/conf/nginx.conf
index 541a47e..f5ee835 100644
--- a/web/conf/nginx.conf
+++ b/web/conf/nginx.conf
@@ -23,7 +23,13 @@ server {
     gzip_disable "msie6";
     gzip_types text/css text/javascript text/xml text/plain text/x-component application/javascript application/json application/xml application/rss+xml font/truetype font/opentype application/vnd.ms-fontobject image/svg+xml;
 
-    add_header Cache-Control "no-cache";
+    set $cache_control "no-cache";
+
+    if ($request_uri ~ "^/(?:msg\.html)?(?:\?.*)?$") {
+      set $cache_control "no-store";
+    }
+
+    add_header Cache-Control $cache_control always;
 
     location / {