Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Yugandhar's avatar
Yugandhar
Icon for Nimbostratus rankNimbostratus
Jul 27, 2018

Reg getfield command in Redirection.

Hi   Is there any difference between the below 2 methods ?.   HTTP::redirect "https://[getfield [HTTP::host] : 1][HTTP::uri]"   HTTP::redirect "https:// [HTTP::host] [HTTP::uri]"   I get...
application delivery
big-ip
irules
Samir_Jha_52506's avatar
Samir_Jha_52506
Icon for Noctilucent rankNoctilucent
Jul 27, 2018

getfield is tcl function and more flexible to grepping exact value in long URL/URI String.

getfield: Split a string on a character and returns the string corresponding to the specific field. The field_number parameter is 1 indexed.

    getfield

  • HTTP::redirect "https://[getfield [HTTP::host] : 1][HTTP::uri]" --> Here Split String/character is 

    :

  • HTTP::redirect "https://[HTTP::host][HTTP::uri]" --> Its common redirection conditions.

Rest didn't observe difference.

  • Yugandhar's avatar
    Yugandhar
    Icon for Nimbostratus rankNimbostratus
    Aug 05, 2018

    Hi F5_Rock,

     

    1. Here getfield functionality is to split the host part i.e. http://test7883.com:8900 ?.

       

    2. what is the use of field_number in the above case it's mentioned as 1 ?.

       

    I am unable to understand why we need to split the host part when we have to do a https redirection for the http request i.e. we wil redirect the http request http://test7883.com:8900 to https://test7883.com:8900

     

    Thanks,

     

    Yugandhar