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Maurice_G_'s avatar
Maurice_G_
Icon for Employee rankEmployee
Jun 17, 2010

POST generates bad request when accelerated

I recently moved an application from big-ip 9.3.1 to big-ip 10.2.9 with WAM. Some HTTP POST get a 400 response from big-ip with WAM. I can workaround the issue by disabling CACHE for such requests. Does anybody have an idea why the WAM would cause such behavior?
application delivery
performance
wa

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  • Maurice_G_'s avatar
    Maurice_G_
    Icon for Employee rankEmployee
    Jun 18, 2010
    In general it varies. But the one that generated the error used Chunked Transfer Encoding...the length was 1570 bytes.
  • Nicolas_Berthie's avatar
    Nicolas_Berthie
    Historic F5 Account
    Jun 18, 2010
    POST + Chunked Transfer Encoding sounds not very good. I would recommand to use an iRule to bypass WAM for POST request :

     

     

    when HTTP_REQUEST {

     

    if {[HTTP::method] equals "POST"}{

     

    WAM::disable

     

    }

     

    }
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Jun 18, 2010
    Could you disable WAM only for POST requests with a transfer-encoding of chunked?

     

     

    Aaron
  • Maurice_G_'s avatar
    Maurice_G_
    Icon for Employee rankEmployee
    Jun 24, 2010
    Thanks so much for your response. I could but I am trying to understand why I need to do this? What exactly is causing the bad request for this POST?
  • Maurice_G_'s avatar
    Maurice_G_
    Icon for Employee rankEmployee
    Jun 24, 2010
    Thanks so much for your response. I did just this but I am trying to understand why I need to do this? What exactly is causing the bad request for this POST?
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Jun 24, 2010
    I'm not sure why it would happen. I'd suggest opening a case with F5 Support to get help diagnosing the issue. In the meantime, as a workaround, you could disable WAM for chunked requests.

     

     

    Aaron
  • Maurice_G_'s avatar
    Maurice_G_
    Icon for Employee rankEmployee
    Jun 25, 2010
    I did open a ticket and have tried to reproduce the issue but cannot. Support has provided a workaround and is looking for the issue to be reproduced in order to take it further.
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