From f05eb6708172c170598fe916357f057ab2791fd8 Mon Sep 17 00:00:00 2001
From: Nolan Lawson <nolan@nolanlawson.com>
Date: Sat, 5 Jan 2019 09:29:53 -0800
Subject: [PATCH] Enable immutable caching for S3 objects (#9722)

I also added "public" here, as I can't think of a good reason not to add it. Perhaps it has some marginal benefit in that ISPs (or other proxies) can cache it for all users. The assets are certainly publicly available and the same for all users.
---
 config/initializers/paperclip.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/config/initializers/paperclip.rb b/config/initializers/paperclip.rb
index df0205879..4bbf8b827 100644
--- a/config/initializers/paperclip.rb
+++ b/config/initializers/paperclip.rb
@@ -25,7 +25,7 @@ if ENV['S3_ENABLED'] == 'true'
     s3_protocol: s3_protocol,
     s3_host_name: s3_hostname,
     s3_headers: {
-      'Cache-Control' => 'max-age=315576000',
+      'Cache-Control' => 'public, max-age=315576000, immutable',
     },
     s3_permissions: ENV.fetch('S3_PERMISSION') { 'public-read' },
     s3_region: s3_region,