From: Tom Hughes <tom@compton.nu>
Date: Fri, 22 Nov 2019 17:06:59 +0000 (+0000)
Subject: Tell browsers they can use stale tiles
X-Git-Url: https://git.openstreetmap.org./chef.git/commitdiff_plain/5b6c232cefcc8d75ba5dae17db4bfb2e70a09385

Tell browsers they can use stale tiles
---

diff --git a/cookbooks/tile/templates/default/apache.erb b/cookbooks/tile/templates/default/apache.erb
index 8df11453b..e5d7f1719 100644
--- a/cookbooks/tile/templates/default/apache.erb
+++ b/cookbooks/tile/templates/default/apache.erb
@@ -40,6 +40,9 @@
   # Add diagnostics header to identify render server
   Header set X-TileRender "<%= node.name %>"
 
+  # Tell clients to use stale tiles if necessary
+  Header append Cache-Control "stale-while-revalidate=604800, stale-if-error=604800" "expr=%{CONTENT_TYPE} == 'image/png'"
+
   # Remove Proxy request header to mitigate https://httpoxy.org/
   RequestHeader unset Proxy early