Nginx HTTP Server - Fourth Edition

Nginx generated

Apart from HTTP headers, Nginx provides a large of variables concerning the request, the way it was and will be handled, as well as settings in use with the current configuration:

Variable	Description
$arg_XXX	Allows you to access the query string (GET parameters), where XXX is the name of the parameter you want to utilize.
$args	All of the arguments of the query string combined together.
$binary_remote_addr	IP address of the client as binary data (4 bytes).
$body_bytes_sent	Amount of bytes sent in the body of the response (does not include response headers).
$bytes_sent	Amount of bytes sent to the client.
$connection	Serial number identifying a connection.
$connection_requests ...