Web Dispatcher

[Former Member]

Can anybody please let me know about web dispatcher. How do we use it in XI and what role does it perform when there is only one WEB AS? Can we use it in sending data to web?

[rodrigoalejandro_pertierr]

he 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 Web 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.

You can use the SAP Web dispatcher in ABAP/Java systems and in pure Java systems, as well as in pure ABAP systems.

It is also beneficial to use the SAP Web dispatcher, if you do not need security functions (entry point in the DMZ, SSL, URL filtering), but you simply want to balance the load between several SAP Web AS instances.

The SAP Web dispatcher is recommended when you use an SAP system with several SAP Web Application Servers for Web applications.

The SAP Web dispatcher is a program that you can run on the machine that is connected directly to the Internet. It requires minimal configuration -

If you want to be able to call the Web application externally, for example using the URL www.shop.acme.com, this host name must be mapped internally to the SAP Web dispatcher. This then forwards the HTTP(S) request to a suitable SAP Web AS.

Functions

The SAP Web dispatcher performs the following tasks:

· Selects an appropriate application server (persistence with stateful applications, load balancing, ABAP or Java server), see Server Selection and Load Balancing Using the SAP Web Dispatcher.

· Filters URLs – you can define URLs that are to be rejected, see SAP Web Dispatcher as a URL Filter

· Depending on the SSL configuration, forwards, terminates, and (re)encrypts requests. See SAP Web Dispatcher and SSL

Restrictions

The SAP Web dispatcher is only useful in the Web environment. In the classic SAP system, load is balanced by the message server.

The SAP Web dispatcher forwards only incoming HTTP(S) requests to the Web application server and the response is then returned to the client.

Outgoing requests (such as requests to a different SAP Web Application Server) are not sent via the SAP Web dispatcher. They are sent via the proxy server for the appropriate intranet.

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You can find details of the change history of the SAP Web dispatcher in collective note SAP Web Dispatcher (SAP note 538405).

Hope this complete solve your doubt

Thanks

Rodrigo

ps:reward points if useful

[Former Member]

hI

web dispactcher is located in web application server and it is used for dispatching messages to abap stack or java stack..

thnq

krisna

[Former Member]

Hi,

Dispatcher comes at application layer(component) in the R/3 environment.It is gonna collect all the informations which are coming from presentation layer and send it to relevent work process.It also collect the data and show u on the presentaion server.

Regards

[hemant_chahal]

Please go through this link.

http://help.sap.com/saphelp_47x200/helpdata/en/42/5cfd3b0e59774ee10000000a114084/frameset.htm

http://mysapinkpot.blogspot.com/2007/11/sap-web-dispatcher.html

I hope this solved your query.

Edited by: Hemant Chahal on Mar 6, 2008 3:01 PM