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Former Member

Detect server node processing a http request

Posted on Feb 11, 2005 at 11:04 AM 6 Views

Is there any way to detect which server node is answering a http request? For debug purposes I would like to add the cluster element to the output of a jsp. Maybe it is also possible to force a jsp being processed by a given node?

Thanks in advance for your answers!

Best regards,

Frank

SAP NetWeaver Application Server for Java
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1 Answer

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    Former Member
    Posted on Feb 11, 2005 at 01:55 PM

    Hi Frank,

    Yes you can trace session cookies in order to understand which server node is answering.

    If you want to force a jsp being processed by a given node you may add before parameters the following:

    saplb_*=(<instance-id>)<server-id>

    More about J2EE Engine cookies you can see here:

    http://help.sap.com/saphelp_nw04/helpdata/en/5b/ac1a0a8b8d6b4da3b79a7fe0aeabd8/content.htm

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    • Former Member
      Feb 11, 2005 at 06:33 PM

      Hi Violeta,

      Thanks for your answer! This has been very helpful indeed.

      However, I´m still a bit puzzled. Replacing the saplb cookie forces the load balancer to use the given server, but the JSESSIONID does not change. Looking at the application data I know that I´m talking to a different server, but I still don´t seem to have a way to tell which server ansered - except my expectation that the saplb cookie might have been taken into account by the server.

      Isn´t there a more sophisticated way to access this kind of information? Escpecially, getting a list of all available servers would be great, as this would allow to choose the server having a look at.

      Best regards,

      Frank