This method is called from the
request object. It returns the HTTP request argument for the given position.
Rather than passing data to your function through HTTP request content, you can also pass in arguments through the URL. Using this method you can retrieve a specific argument from the URL determined by its position. To retrieve all URL arguments, use
getArguments(). To retrieve HTTP request parameters, see
var arg = request.getArgument(<position>)
<position>Defines the position of the argument you want to retrieve.
This method returns a string of the argument passed to the function through the HTTP request URL. It determines which argument to return by the given position. If it doesn't find an argument for the given position, it returns