Refer to Members of a Collection With the Full Name

You can access all variables directly by calling Request(variable) without the collection name. In this case, the Web server searches the collections in this order:

 QueryString Form Cookies ClientCertificate ServerVariables 

If a variable with the same name exists in more than one collection, the Request object returns the first instance that the object encounters. As a result, it is good practice to refer to members of a collection with the full name. For example, rather than Request(AUTH_USER), use Request.ServerVariables(AUTH_USER). This technique allows the server to locate the item more quickly. If you are referring to a variable that is not in one of the five collections, the Request object returns EMPTY.

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