proxy_cache_path /data/nginx/cache keys_zone=my_zone:10m inactive=1d;
server {
    ...
    location /api-endpoint/ {
        proxy_cache my_zone;
        proxy_cache_key "$host$request_uri$http_authorization";
        proxy_cache_valid 404, 302 1m;
        proxy_cache_valid 200 1d;
        add_header X-Cache-Status $upstream_cache_status;
    }
    ...
}