如何避免在nginx中重复add_header指令？

文档说明了这一点：

These directives are inherited from the previous level if and only if there are no add_header directives defined on the current level.

我的问题是我有几个我要缓存的位置块,如下所示：

add_header X-Frame-Options SAMEORIGIN;
add_header Strict-Transport-Security "max-age=31536000; includeSubdomains;";

location ~ ^/img/(.*).(png|jpg|jpeg|gif|bmp)${
    expires 1w;
    add_header Cache-Control public;
}

但这将使我失去在块外宣布的所有标题.显然,唯一的方法是在每个位置块上复制这些标头,例如：

add_header X-Frame-Options SAMEORIGIN;
add_header Strict-Transport-Security "max-age=31536000; includeSubdomains;";

location ~ ^/img/(.*).(png|jpg|jpeg|gif|bmp)${
    expires 1w;
    add_header Cache-Control public;
    add_header X-Frame-Options SAMEORIGIN;
    add_header Strict-Transport-Security "max-age=31536000; includeSubdomains;";
}

似乎不对.有任何想法吗？