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Mark_58017's avatar
Mark_58017
Icon for Nimbostratus rankNimbostratus
Jan 09, 2013

iRule to check header length

Hi,

 

I have a customer that wishes to send larger queries to a different pool. He's noticed the difference between queries can be decided by header length. He wants an iRule that picks up another pool if the header length is over 50k.

 

I've tried a couple of different iRules pulled from here and amended to no avail. I haven't specified them as I'm looking for a fresh take on the problem.

 

Thanks in advance.

 

 

application delivery
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devops
iRules

6 Replies

  • Mark_58017's avatar
    Mark_58017
    Icon for Nimbostratus rankNimbostratus
    Jan 09, 2013
    Apologies I wasn't clear it is the payload length that we wish to interrogate.
  • hoolio's avatar
    hoolio
    Icon for Cirrostratus rankCirrostratus
    Jan 09, 2013
    If the client sets a content-length header in the request you could check that with [HTTP::header Content-Length]: 

    
when HTTP_REQUEST {
    Check if client is sending more than 500 bytes
   if { [HTTP::header Content-Length] > 500 }{
       Select big_pool
      pool big_pool
   } else {
      pool my_default_pool
   }
}

    Aaron

  • Mark_58017's avatar
    Mark_58017
    Icon for Nimbostratus rankNimbostratus
    Jan 10, 2013
    Thanks, I'm not sure if that field is in there but I've stuck it on there to test.
  • Tim_K_92675's avatar
    Tim_K_92675
    Icon for Cirrostratus rankCirrostratus
    Jan 10, 2013
    For payload length maybe - http::payload length

     

     

    https://devcentral.f5.com/wiki/irules.http__payload.ashx