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stream {
    #resolver 114.114.114.114;
    server {
        listen 443;
        ssl_preread on;
        proxy_connect_timeout 5s;
        proxy_pass $ssl_preread_server_name:$server_port;
    }
}

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map $ssl_preread_server_name $sni_port {
    default                  $server_port;
    backend.example.com      8130;
 }

map $ssl_preread_server_name $sni_server {
    default                  $$ssl_preread_server_name;
    backend.example.com      127.0.0.1;
 }



 upstream backend {
     server 127.0.0.1:3129;
 }

 upstream backend2 {
     server 192.168.0.1:12345;
 }

stream {
    #resolver 114.114.114.114;
    server {
        listen 443;
        ssl_preread on;
        proxy_connect_timeout 5s;
        #proxy_pass $ssl_preread_server_name:$server_port;
        proxy_pass $sni_server:$sni_port;
    }
}