Nginx – using single nginx server to serve/proxy PHP, Python and NodeJS

I am trying to figure out how best to use Nginx as proxy for serving PHP (via PHP5-FPM), Python (via gunicorn) and NodeJS. My current default file in the sites-available directory is copied below. Should I be attempting to configure multiple servers or make other changes in order to enable this functionality? Thanks in advance.

Update:
Currently, with the current config, Nginx is serving as a proxy to NodeJS application. However, it is no longer serving PHP content anymore. Should I be using a different server in the default file and if so, should I be able to use the same listening port but just use a different server_name and use the location tag to differentiate between the requests?

I am trying to route certain URL requests to a PHP application (in /var/www – I switched from /usr/share/nginx) as well as to Python and Nodejs backends.

One thought that I have not implemented is to try multiple upstream and have the PHP setup in the main server – would that work i.e. have one upstream for NodeJS, one for Python and then the server for PHP.

upstream test {
        server 0.0.0.0:3002;
        keepalive 500;
}


server {
        listen 81 default_server;
        listen [::]:81 default_server; ##remove this?

        root /var/www/;  ##switched from /usr/share/nginx
        index index.php index.html index.htm;

        server_name localhost; 

        location / {
                proxy_redirect off;
                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 Host $http_host;
                proxy_set_header X-Nginx-Proxy true;
                proxy_set_header Connection "";
                proxy_http_version 1.1;
                proxy_pass http://0.0.0.0:3002;
        }

        location /doc/ {
                alias /usr/share/doc/;
                autoindex on;
                allow 127.0.0.1;
                allow ::1;
                deny all;
        }

        # Only for nginx-naxsi used with nginx-naxsi-ui : process denied requests
        location /RequestDenied {
                proxy_pass http://127.0.0.1:4242;
        }

        location ~ \.php$ {
                fastcgi_split_path_info ^(.+\.php)(/.+)$;
        #       fastcgi_pass 127.0.0.1:9000;
        #       # With php5-fpm:
                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                include fastcgi_params;
        }
}


# another virtual host using mix of IP-, name-, and port-based configuration
#
server {
        listen 82;
        root /var/www/;
        index index.php index.html index.htm;
        server_name php;
        location ~ /testPHP {    //testPHP is part of URL/directory name in /var/www/
                fastcgi_split_path_info ^(.+\.php)(/.+)$;
                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                include fastcgi_params;
        }

        location ~ \.php$ {
                fastcgi_split_path_info ^(.+\.php)(/.+)$;
                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                include fastcgi_params;
        }

}