diff --git a/docker/main/rootfs/usr/local/nginx/conf/nginx.conf b/docker/main/rootfs/usr/local/nginx/conf/nginx.conf
index 9251684633..1d3b80de3e 100644
--- a/docker/main/rootfs/usr/local/nginx/conf/nginx.conf
+++ b/docker/main/rootfs/usr/local/nginx/conf/nginx.conf
@@ -34,7 +34,7 @@ http {
 
     proxy_cache_path /dev/shm/nginx_cache levels=1:2 keys_zone=api_cache:10m max_size=10m inactive=1m use_temp_path=off;
 
-    map $http_accept $should_not_cache {
+    map $sent_http_content_type $should_not_cache {
         'application/json' 0;
         default 1;
     }
@@ -261,4 +261,4 @@ rtmp {
             meta copy;
         }
     }
-}
\ No newline at end of file
+}