Wednesday, 20 July 2011

SAP Web Dispatcher and its functions

This article answers the following queries :

  • What is SAP Web dispatcher ?

  • What is Demilitarized zone (DMZ)?

  • What are the advantages of DMZ ?

  • Where does SAP Web dispatcher runs?

  • What are the functions of SAP Web dispatcher ?




SAP WEB DISPATCHER :

SAP web dispatcher is used to distribute web requests.  It is based on the same technology as SAP ICM(Internet Communication Manager).

Please note that apart from web dispatcher, web requests can also be distributed through message server or ICM. However, these have only limited functionality and some disadvantages and is therefore not recommended by SAP.

SAP web dispatcher is the SAP recommended process/method of distributing web requests as it has some advantages and additional functionality.


Demilitarized Zone (DMZ) :

In computer networks, a DMZ is a computer or a small network inserted as a neutral zone between  a company’s private network and the outside public.
It prevents external  users from directly accessing the company’s server and thus provides security.

In SAP scenario, DMZ is a neutral zone inserted between internet and  SAP Netweaver Application server so that external users from internet cannot directly access  SAP netweaver application server.

SAP Web Dispatcher runs within the DMZ


Functions of SAP Web Dispatcher :

  • Distribution of  requests to both ABAP or Java application instances

  • Denial of unwanted requests  (i.e. request filtering)

  • Buffering of web requests

  • Ensures that customers can access the SAP system via one address

  • Provides security as it runs in DMZ (Demilitarized zone)

  • Handles distribution of both http and https requests.



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