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Cannot see location = /nginx in backend servers

Cannot see statistics in location = /nginx in backend servers
I can not send the ip address from the proxy server to the backend servers.
Help me please setting nginx. server.com/nginx show me 403 Forbidden
nginx. But my IP address is 999.999.999.999(it is not my real ip).
It is my conf files
https://drive.google.com/open?id=1ks3KYBepafMQTopHfk_3hlZ740KVyY2N

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