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load balancing: web dispatcher vs. message server

I couldn't find a sufficient answer, why I should use the web dispatcher.

Is it because of the enhanced functionality ?

Or is there trouble in using the message server for dispatching http-requests?



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2 Answers

  • Best Answer
    Posted on Jan 29, 2010 at 12:17 PM

    To quote SAP:

    You can use HTTP load balancing on the SAP Message Server for stateless applications only. For stateful Web applications with a state in the back end (such as BSP applications), you require the Web Dispatcher.

    You can only use the SAP message server for HTTP load distribution if the browser is the direct client of the message server. If another component lies between the client (browser) and the message server, (for example, the portal), you cannot use the message server to distribute the load.


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  • author's profile photo Former Member
    Former Member
    Posted on Feb 01, 2010 at 11:46 PM

    Hello Franz,

    Refer to the following page for short decription of the main SAP Web Dispatcher 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 u2013 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

    The message server could do only starless-session load balancing.


    Ventsi Tsachev

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