iRule to determine whether to server Custom or default maintenance page

Hi Rflon2015,

to implement an additional error handle, for the case that the data-group entry already exist, but the iFile can somehow not found, you may try the syntax below...

when HTTP_REQUEST {
     set $myfile to the name of the desired iFile found in the data-group IIS_DG
     ifile must match the name of the pool
    set myfile [class match -value [string tolower [HTTP::host]] equals IIS_DG ] 
     log local0. "Maint iRule, MYFILE=$myfile"  
    if { $myfile ne "" } then {
         if myfile is not NULL, a valid name:value has been found
         server the desired iFile
        if { [catch {
            HTTP::respond 503 content [ifile get $myfile]
        }]} then {
            HTTP::respond 503 content [ifile get IIS_maint_txt] 
        }
    } else { 
         a valid name:value has not been found
         serve the default iFile
        HTTP::respond 503 content [ifile get IIS_maint_txt] 
    }
}

Cheers, Kai