Forum Discussion
Maurice_G_
Employee
EmployeePOST 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?
- Maurice,
What is size of your POST request ?
Nicolas 
Maurice_G_In general it varies. But the one that generated the error used Chunked Transfer Encoding...the length was 1570 bytes.- 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
}
} - hoolio
Cirrostratus
Could you disable WAM only for POST requests with a transfer-encoding of chunked?
Aaron - Maurice_G_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_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?
- hoolioI'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_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.
