Forum Discussion
BunnyJunJun
Altostratus
AltostratusiRule 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...
local0. goes to the LTM log:
tail -f /var/log/ltm
Kevin_Stewart
Employee
EmployeeSomething like this maybe:
when HTTP_REQUEST {
foreach x [string tolower [HTTP::header names]] {
if { ( $x starts_with "sec-ch" ) and ( [HTTP::header $x] eq "" ) } {
log local0. "found empty sec-ch header"
}
}
}
BunnyJunJunHi Kevin,
Thanks! I did roughly the same, however, in your context, x has no value. It is not even a string. Hence, quite hard for me to further "manipulate" x.
I was thinking to concatenate it like those we do for typical coding. (i.e. var temp = "" + x, and temp will be a string with x valueless). Is this possible in terms of iRules?
- Kevin_Stewart
x is the header name. Are you saying the header doesn't exist?
- BunnyJunJun
Hi Kevin,
Header exist. An example of the request captured would be as such.
Header A: valueA
Header B: valueB
sec-ch-mobile:
Header C: valueCGiven the idea of above, sec-ch-mobile has no value and it is not an empty string. As such, how do i check for x is an empty value given your sample iRules above?