Variable - Nginx

These expressions are equivalent

$uri
"$uri"
${uri}
"${uri}"

Var Index

Variable	Alias	Description
`$uri`	`$document_uri`	URI, exclude `$args`, change when internal redirect / using `index`
`$args`	`$query_string`	query string (the string after `?` in URI)
`$document_root`		`root` or `alias` value
`$host`		`$host`
`$http_host`		`Host` request header field
`$request_uri`	`$request`	full original request URI (with `$args`)
`$remote_addr`		client IP address
`$remote_port`		client port

`$host`

In this order of precedence (from high to low)

Validation