我正在尝试添加一个新的服务器变量Add-WebConfiguration/system.webServer/rewrite/allowedServerVariables-atIndex0-value@{name="HTTP_COOKIE"}但是我得到以下错误Add-WebConfigurationProperty:Filename:Error:Cannotaddduplicatecollectionentryoftype'add'withuniquekeyattribute'name'setto'Test'Atline:1char:1+Add-WebConfigurationPrope