nginx配置了2个子域名的反向代理，配置如下：

   
    upstream fileServer {
        #server 10.128.1.84:8080;
        server 10.128.1.231:8080;
    }

    server {
        listen       8443 ssl;
        server_name  file.shftz.cn;
        ssl_certificate cert/shftz_ssl.pem;
        ssl_certificate_key cert/shftz_ssl.key;
        ssl_session_timeout 5m;
	ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
        ssl_prefer_server_ciphers on;

        #ssl_certificate      cert.pem;
        #ssl_certificate_key  cert.key;
        #ssl_session_cache    shared:SSL:1m;
        #ssl_session_timeout  5m;
        #ssl_ciphers  HIGH:!aNULL:!MD5;
        #ssl_prefer_server_ciphers  on;

	error_page 497  https://$server_name:8443$request_uri;


        location /filesystem/ {
            #proxy_pass http://10.128.1.84:8080/filesystem/;
            proxy_pass http://fileServer/filesystem/;
            proxy_set_header Host $host;
            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  $scheme;
	        #proxy_set_header reqType enterprise;   # 自定义
            client_max_body_size 1000m;

	    proxy_http_version 1.1;
	    proxy_set_header Upgrade $http_upgrade;
	    proxy_set_header Connection  "upgrade";

        }
	    location /favicon.ico {
	        log_not_found off;
	        access_log off;
	    }
    }


    server {
        listen 80;
        server_name udc.shftz.cn;
        return      301 https://$server_name$request_uri;
    }

    upstream  mascot.cn {   
        server    10.128.1.91:8080  weight=2; 
        server    10.128.1.68:8080  weight=1;  
    }

    server {
        listen       443 ssl;
        server_name  udc.shftz.cn;


        add_header X-Frame-Options SAMEORIGIN;
        #add_header  Content-Security-Policy  "frame-ancestors 'self';";
	add_header X-Xss-Protection 1;
        add_header Strict-Transport-Security "max-age=63072000; includeSubdomains; preload";



       # ssl on;
        ssl_certificate cert/shftz_ssl.pem;
        ssl_certificate_key cert/shftz_ssl.key;
        ssl_session_timeout 5m;
        #ssl_protocols SSLv2 SSLv3 TLSv1;
        ssl_protocols TLSv1.2;
        #ssl_ciphers ALL:!ADH:!EXPORT56:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
	ssl_ciphers "ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:EDH-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4";
	ssl_prefer_server_ciphers on;

        #让http请求重定向到https请求
        error_page 497  https://$server_name$request_uri;

        location / {
            proxy_pass http://10.128.1.68:8080;
            proxy_set_header Host $host;
            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  $scheme;
            #proxy_set_header reqType enterprise;   # 自定义
            client_max_body_size 1000m;
	    deny  199.168.100.74;
        }
        location /favicon.ico {
            log_not_found off;
            access_log off;
        }
    }
但是在访问 https://file.shftz.cn/ 会访问到udc.shftz.cn， 实际应该无资源。这种情况是什么问题