From d9b0e08ea2a3cb87f79f4507ece3f4bc147d5380 Mon Sep 17 00:00:00 2001
From: David Baker <dave@matrix.org>
Date: Thu, 12 Jan 2023 16:20:37 +0000
Subject: [PATCH] Fix caching headers on Docker image

---
 config/nginx.conf | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/config/nginx.conf b/config/nginx.conf
index 2af6c30..f725346 100644
--- a/config/nginx.conf
+++ b/config/nginx.conf
@@ -2,9 +2,24 @@ server {
     listen       8080;
     server_name  localhost;
 
+    root   /app;
+
     location / {
-        root   /app;
+        # disable cache entriely by default (apart from Etag which is accurate enough)
+        add_header Cache-Control 'private no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
+        if_modified_since off;
+        expires off;
+        # also turn off last-modified since they are just the timestamps of the file in the docker image
+        # and may or may not bear any resemblance to when the resource changed
+        add_header Last-Modified "";
+
         try_files $uri /$uri /index.html;
     }
+
+    # assets can be cached because they have hashed filenames
+    location /assets {
+        expires 1w;
+        add_header Cache-Control "public, no-transform";
+    }
 }