Forum Discussion

Altostratus

Sep 27, 2022

Solved

iRule Checking for No Value

Hi All, Just want to check with the fellow community members if you all have any idea on how to use iRules to check for no value? Basically, I am crafting an iRule that search for all headers and s...

security

Kevin_Stewart
Oct 27, 2022
local0. goes to the LTM log:

tail -f /var/log/ltm

Kevin_Stewart

Employee

Sep 28, 2022

Not sure I completely understand. the sec-ch-mobile header has no value and is not an empty string? I don't think it can be both of these. Try logging what the value actually is:

when HTTP_REQUEST {
    foreach x [string tolower [HTTP::header names]] {
        if { $x starts_with "sec-ch" } {
            log local0. "header($x) == |[HTTP::header $x]|"
        }
    }
}

I put the pipes in there to show if there's actually just white space. Still technically a non-empty string, not equal to "".

BunnyJunJun

Altostratus

Oct 27, 2022

Hi Kevin, any idea how do i access the logs? I am accessing via putty and when i am in the tmsh, i tried to quit tmsh and the whole command prompt just closes.. 😞