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These are global default variables. To edit variables for a specific realm go to Variable Realms

Advanced settings not usually exposed. Changing these variables may seriously break your site so make sure you know what you do.

Invoke boot and exit hooks when the page is served from cache.
Maximum recursion level for actions before the execution is aborted.
Number of enabled languages, used for quick bootstrap. Not to be changed manually.
Language types
Available language types.
If Drupal is behind a reverse proxy, we use the X-Forwarded-For header instead of $_SERVER['REMOTE_ADDR'], which would be the IP address of the proxy server, and not the client's. The actual header name can be configured by the reverse_proxy_header variable.
Reverse proxy addresses
If an array of known reverse proxy IPs is provided, then trust the XFF header if request really comes from one of them.