unknown directive "allow 127.0.0.1" in /etc/nginx/conf.d/acl.conf

Issue

When I try to deploy an IP blocking rule on the webserver service, I get this message:
```
unknown directive "allow 127.0.0.1" in /etc/nginx/conf.d/acl.conf:1
```
I have reviewed the directive and it is correct:
```
allow 127.0.0.1;
deny all;
```

Nginx has not recognized the directive in the configuration file.
It's probably that your editor has inserted an invisible formatting character that is not a normal ASCII space:
It can also happen when you copy and paste settings between different operating systems.
Please check the Nginx configuration file.