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Get ip user with nginx and node

I have a problem with nginx and node, because when I want to get the ip of the user with node, it works fine in my localhost (don't use nginx), but it doesn't work on my server as it should. I researched and see that node no - the first one that gets ip is nginx and after nginx sends a request to node. then the ip that node receives is my server, not the user's ip address. look at the nignx configuration server:

location / {
        proxy_pass https://fotogena.co:8000;  <-nginx send req to node
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_connect_timeout   1000;
        proxy_send_timeout      1500;
        proxy_read_timeout      2000;
}

I use "req.connection.remoteAddress" to find out the ip of the user, and the console will show me the ip of my server. Does anyone know how to solve this problem?

thanks: D

----------- 2016-04-20 --------

I can solve the problem with this line in setting up the nginx file

proxy_set_header X-Real-IP $remote_addr;

and node.js

req.headers['x-forwarded-for']
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source
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NGINX IP- :

location / {
        proxy_pass https://fotogena.co:8000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;  # This line.
        proxy_connect_timeout   1000;
        proxy_send_timeout      1500;
        proxy_read_timeout      2000;
}

HTTP- X-Real-IP req.headers["X-Real-IP"].

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