HTTP Collections

Collections are the properties of the HttpRequest.
The Collections are present in the "System.Collections.Specialized" namespace.
It is also called as NamedValueCollection.
We can access the value from the string key.
The below example shows the Server variable collection by using this how we can read the value of QUERY_STRING and HTTP_USER_AGENT.

Dim queryStr As String = Request.ServerVariables ("QUERY_STRING")

Dim agentStr as String = Request.ServerVariables ("HTTP_USER_AGENT")

Collection:

Property	Meaning
Cookies	Collection of cookies sent by the client
Form	form variables
Headers	HTTP headers
ServerVariables	Contains all the server variable values