@greenskinmonster 貌似不行啊~~
upstream jsjc.domain.io:30000 {
server kakxkakx.domain.io:30000 weight=1;
server jsjc.myqnapcloud.com:30000 weight=1;
server test.henjimo.com:30000 weight=1;
}

server
{
listen 80;
server_name thenas.domain.io;

if ($http_user_agent ~* (baiduspider|360spider|haosouspider|googlebot|soso|bing|sogou|yahoo|sohu-search|yodao|YoudaoBot|robozilla|msnbot|MJ12bot|NHN|Twiceler)) {
return 403;
}

location / {
sub_filter jsjc.domain.io:30000 thenas.domain.io;
sub_filter_once off;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Referer http://jsjc.domain.io:30000;
proxy_set_header Host jsjc.domain.io:30000;#此处注意
proxy_pass http://jsjc.domain.io:30000;
proxy_set_header Accept-Encoding "";
}
}