proxy.conf

map $remote_addr $proxyaddr{
    default http://10.0.0.5:8001;

    10.0.1.7 http://10.0.1.7:8001;
}
server {
    listen       8001;
    server_name  localhost;


    location / {
        proxy_pass http://10.0.0.5:8001;
    }

    location /some/service {
        proxy_pass $proxyaddr;
    }
}