nginx 反向代理替换图片的问题

完整配置文件如下，需求是将http://search.xiaoz.me中包含的图片http://pic.bsdev.cn替换为HTTPS：https://pic.bsdev.cn

server
{
        listen 443;
        server_name so.xiaoz.me;
        ssl on;
        ssl_certificate /etc/letsencrypt/live/so.xiaoz.me/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/so.xiaoz.me/privkey.pem;
        location / {
                proxy_redirect off;
                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 https;
                proxy_pass http://search.xiaoz.me;
                subs_filter_types text/html text/css text/xml;
                subs_filter http://pic.bsdev.cn https://pic.bsdev.cn;
        }
}
server
{
        listen 80;
        server_name so.xiaoz.me;
        rewrite ^(.*) https://so.xiaoz.me$1 permanent;
}

此贴终结，无法使用subs_filter替换的原因是开启了Gzip导致，6楼回复正解。在location中加入proxy_set_header Accept-Encoding "";，重启nginx后完美解决。被坑了几个小时