lua - Receive traffic from specific FQDN in NGINX -

so, here's thing. want allow connections specific fqdn (not ip) in marathon i.e. myapp.marathon.mesos using nginx , block other connections. i'm aware lua module in nginx capable of doing such things wandering if there's in built in nginx so.

my intention in nginx.conf:

server {     listen 6600;      myplatform.marathon.mesos;      ssl off;      location / {         proxy_pass http://localhost:5618/;         proxy_http_version 1.1;         proxy_set_header host $host;         proxy_cache_bypass $http_upgrade;         proxy_set_header    x-forwarded-port  $server_port;         proxy_set_header    x-forwarded-proto $http_x_forwarded_proto;         proxy_set_header    host              $http_host;         proxy_set_header    x-forwarded-for   $proxy_add_x_forwarded_for;         allow myapp.marathon.mesos;  # allow fqdn         deny all;                    # restrict     }  }