nginx multi sub domain proxy

#SSL-START SSL相关配置，请勿删除或修改下一行带注释的404规则
#error_page 404/404.html;
ssl_certificate /www/server/panel/vhost/cert/fr.audisound.net/fullchain.pem;
ssl_certificate_key /www/server/panel/vhost/cert/fr.audisound.net/privkey.pem;
ssl_protocols TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers EECDH+CHACHA20:EECDH+CHACHA20-draft:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:EECDH+3DES:RSA+3DES:!MD5;
ssl_prefer_server_ciphers on;
ssl_session_cache shared:SSL:10m;
ssl_session_timeout 10m;
add_header Strict-Transport-Security "max-age=31536000";
error_page 497 https://$host$request_uri;

#SSL-END

#ERROR-PAGE-START 错误页配置，可以注释、删除或修改
#error_page 404 /404.html;
#error_page 502 /502.html;
#ERROR-PAGE-END

#PHP-INFO-START PHP引用配置，可以注释或修改
include enable-php-00.conf;
#PHP-INFO-END

#REWRITE-START URL重写规则引用,修改后将导致面板设置的伪静态规则失效
include /www/server/panel/vhost/rewrite/fr.audisound.net.conf;
#REWRITE-END

#禁止访问的文件或目录
location ~ ^/(\.user.ini|\.htaccess|\.git|\.svn|\.project|LICENSE|README.md)
{
return 404;
}

#一键申请SSL证书验证目录相关设置
location ~ \.well-known{
allow all;
}

location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$
{
expires 30d;
error_log /dev/null;
access_log /dev/null;
}

location ~ .*\.(js|css)?$
{
expires 12h;
error_log /dev/null;
access_log /dev/null;
}

# define subdomain
set $subdomain "";

location / {
proxy_set_header Accept-Encoding "";
sub_filter_types *;
#default_type text/html;

#正则截取域名前缀，例如www.xxx.com截取只要www
if ( $host ~* (.*)\.(.*)\. ) {
set $domain $1;
}
set $url https://hearingaid.cc/$domain/site/audisound.net$request_uri;
# set $url https://hearingaid.cc/$domain/site/audisound.net/;
proxy_pass https://hearingaid.cc:443/$domain/site/audisound.net$request_uri;

#proxy_pass http://hearingaid.cc/$host/;
sub_filter 'hearingaid.cc' 'audisound.net';
sub_filter '/$domain/' '/';
sub_filter_once off;

}