EdgeScript built-in variables - CDN - Alibaba Cloud Documentation Center

This topic describes EdgeScript built-in variables and the corresponding NGINX variables.

Note

The dollar sign ($) before a variable is used to specify that the variable is a built-in variable. You can remove the dollar sign based on your business requirements.
Do not assign values to built-in variables in the same way as parameters.
You can specify at most 200 variables in a script. To use more than 200 variables, split the function.

The following table describes the EdgeScript built-in variables.

Built-in variable	Description	NGINX variable
$arg_{name}	The value of the `name` parameter in the `query string`. The `query string` represents request parameters in an HTTP request.	$arg_ Note If the `{name}` field contains a hyphen (-), `req_uri_arg` instead of `$arg_` is used to extract the header value. If the request is `http://example.com/1.jpg?example-demo=123`, the header value is extracted based on `req_uri_arg('example-demo')`.
$http_{name}	The value of the name field in the request header.	$http_ Note Hyphens (-) in the `{name}` field must be replaced by underscores (_). For example, `X-USER-ID` must be changed to `$http_x_user_id`.
$cookie_{name}	The value of the name field in the request cookie header.	$cookie_ Note If the `{name}` field contains a hyphen (-), `req_cookie` instead of `$cookie_` is used to extract the header value. If the request is `cookie:example-demo=123`, the header value is extracted based on `req_cookie('example-demo'`.
$scheme	The protocol type.	$scheme
$server_protocol	The protocol version.	$server_protocol
$host	The original host.	$host
$uri	The original URI.	None
$args	`$args` represents all request parameters in an HTTP request, excluding question marks (`?`). In the request `http://example.aliyundoc.com/1k.file?k1=v1&k2=v2`: `$arg_k1` returns the value of the k1 parameter: `v1`. `$args` is used to return the entire query string: `k1=v1&k2=v2`. Question marks (`?`) are excluded.	$args
$request_method	The request method.	$request_method
$request_uri	The content of `uri+'?'+args`.	$request_uri
$remote_addr	The IP address used by the client to connect to points of presence (POPs).	$remote_addr

Splitting function

When your rule contains more than 200 variables, split the original function into multiple user-defined functions. Ensure that each user-defined function contains no more than 200 variables.

The following shows an example:

#If variables exceed the limit, split them like this:
def judeg_arg() {
  #Parameter judgment related logic
  x
  x
}

def judeg_time() {
  #Time judgment related logic
  x
  x
}

def judeg_token() {
  #Encryption judgment related logic
  x
  x
}

judeg_arg()
judeg_time()
judeg_token()