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 global variables and an unlimited number of local variables in a script. To specify more than 200 global variables in a script, create a custom function and use the global variables as local variables in 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 htp://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 version of the protocol. $server_protocol
$host The original host. $host
$uri The original URI. Disabled
$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 of the client that sends the request. $remote_addr