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server {
    listen       443 ssl;
    server_name  www.a.com;
    location / {
        proxy_pass http://192.168.1.100;
        proxy_redirect  http://$host/ /;
        proxy_set_header Host $host:$server_port;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Real-PORT $remote_port;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        add_header Access-Control-Allow-Origin *;
        add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS';
        add_header Access-Control-Allow-Headers 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
 
        if ($request_method = 'OPTIONS') {
            return 204;
        }
    }
 
}