Answer / venkat

The SAP Web dispatcher lies between the Internet and your SAP system. It is the entry point for HTTP(s) requests into your system, which consists of one or more NetWeaver application servers. As a "software web switch", the SAP Web dispatcher can reject or accept connections. When it accepts a connection, it balances the load to ensure an even distribution across the servers. The SAP Web Dispatcher therefore contributes to security and also balances the load in your SAP system.
You can use the SAP Web Dispatcher in ABAP/Java systems and in pure Java systems, as well as in pure ABAP systems.

Answer / jogi

Web Dispatcher is an SAP instance which will be used for below purposes.
1) URL masking
2) accesspts the requests from external SAP system and forwards them to the target SAP message server
3) Web Dispatcher will not do load balancing, but the web dispatcher will be configured to the target message server which will do the load balancing
4) We can block the communication between Target system and other systems by just stopping the web dispatcher.

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