When an HTTP request message is received by the Web server application, the headers of the client request are loaded into the properties of an object descended from TWebRequest. For example, in NSAPI and ISAPI applications, the request message is encapsulated by a TISAPIRequest object, and console CGI applications use TCGIRequest objects. 

The properties of the request object are read-only. You can use them to gather all of the information available in the client request, including

• Request header information
• The content of the request message