What functions SAP Web Dispatcher provides?

SAP Web Dispatcher provides the following function:

• Distribution of requests to ABAP or Java application instances, both for HTTP and HTTPS requests.
• Request filtering: The SAP Web Dispatcher can deny unwanted requests.
• Buffering of Web requests.
• Unchangeable Web addresses: Independent of the application instance’s name, the SAP Web Dispatcher ensures that users can always access the system via one address.
• Security: Provided that security restrictions between the Internet and SAP NetWeaver Application Server require a demilitarized zone (DMZ) that is bordered by two firewalls, the SAP Web Dispatcher runs within 
• this DMZ.

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