Route png requests to Elixir app and cache it good

docker-compose.yml

@@ -62,3 +62,4 @@ services:
       - ./uploads:/app/uploads
       - ./log:/app/log
       - /tmp/asciinema-web:/tmp
+      - ./volumes/cache:/cache

docker/nginx/asciinema.conf

@@ -10,6 +10,9 @@ upstream clj-server {
     server 127.0.0.1:5000 fail_timeout=0;
 }
 
+proxy_cache_path /cache levels=1:2 keys_zone=png_cache:10m max_size=10g
+                 inactive=14d use_temp_path=off;
+
 server {
     listen 80 default_server;
     listen [::]:80 default_server;
@@ -25,7 +28,19 @@ server {
     }
 
     location ~ ^/a/[^.]+\.png$ {
-        try_files $uri $uri/index.html $uri.html @clj;
+        proxy_cache png_cache;
+        proxy_cache_revalidate on;
+        proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
+        proxy_cache_lock on;
+        proxy_cache_key $uri;
+        proxy_ignore_headers Set-Cookie;
+
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header Host $http_host;
+        proxy_pass http://phoenix-server;
+        proxy_redirect off;
     }
 
     location ~ ^/a/[^.]+\.(json|gif)$ {