server {
    listen   80;
    server_name www.domain.com domain.com;
    access_log /home/user101/unic/logs/access.log;
    error_log /home/user101/unic/logs/error.log;

    location / {
       root  /home/user101/unic;
       index  index.html index.htm;
       proxy_set_header X-Real-IP $remote_addr;
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
       proxy_set_header Host $http_host;
       proxy_set_header X-NginX-Proxy true;
       proxy_pass http://172.38.421.49:3000/;
       proxy_redirect off;
    }
}

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i want to add php fast cgi, where this should go?

 # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        location ~ \.php$ {
                fastcgi_pass   127.0.0.1:9000;
                fastcgi_index  index.php;
                fastcgi_param  SCRIPT_FILENAME  /var/www$fastcgi_script_name;
                include fastcgi_params;
        }