Forum Discussion

jba3126's avatar
jba3126
Icon for Cirrus rankCirrus
Mar 31, 2017

iRule to Rewrite User Agent Header

We have a client that has an internal browser policy for IE to run in compatibility mode due to legacy applications. Unfortunately with the latest update to our application servers this causes issues...
application delivery
iRules
LTM
ltm policy
Stanislas_Piro2's avatar
Stanislas_Piro2
Icon for Cumulonimbus rankCumulonimbus
Apr 02, 2017

Hi,

you can merge MSIE 6 to 9 versions in one switch value:

when HTTP_REQUEST { 
     Rewrite the User-Agent header value to show up supported browser 
    switch -glob -- [string toupper [HTTP::header User-Agent]] {
        "*MSIE [6789]*" -
        "*MSIE 10*" {
             Replace the User-Agent header with supported user agent
            HTTP::header replace "User-Agent" "Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko" 
        }
        default {
        }
    }
}

Also use -- between the last switch parameter and the string to compare. it will prevent minus character in string to be evaluated as another parameter.