Forum Discussion

Marcus_Hong_Yu's avatar
Marcus_Hong_Yu
Icon for Nimbostratus rankNimbostratus
Sep 14, 2017

HTTP monitor match string

Hi Guys,

 

I got a question about the match receiving string in HTTP monitor. for example. one of the application is requesting F5 to monitor by http monitor, and keep pool member enabled when receiving "2" from response. disable pool member when receiving "1". however, when the server is responding to GET request, it also replied with 200 OK. which means it will always have a matching 2 in the return string. is there any good way I can have F5 ignore "200 OK" but only look for that specific string "2"

 

application delivery
LTM
  • Jad_Tabbara__J1's avatar
    Jad_Tabbara__J1
    Icon for Cirrostratus rankCirrostratus
    Sep 14, 2017

    Hi Marcus,

     

    I recommend you to send something more specific than "2" or "1".

     

    Because the sytem applies a grep on the response received for the monitored URL.

     

    One letter or one digit will generates a lot of false positive... Instead of responding "1" and "2" configure your server to send for example "hostname.domain.com disabled" and "hostname.domain.com enabled"

     

    Then modify you monitor.

     

    Give me a feedback

     

    Regards

     

  • Stanislas_Piro2's avatar
    Stanislas_Piro2
    Icon for Cumulonimbus rankCumulonimbus
    Sep 14, 2017

    Hi,

    I guess you can use following receive string

    \r\n\r\n.*2

    It may search the 2 in the payload (after the blank line).

    But I agree JTI a longer string may be better except if the answer is only 2 and then you may use

    \r\n\r\n2