Maintenance Page iRule and other iRule Conflicting.

You can't add a header after you have issued an HTTP::respond command. This will likely be why you get an error you will need to add a

return

I have put the two iRules together as given they are relatively simple, there is no need for them to be separate.

when HTTP_REQUEST { 
    if {[active_members /partition/poolname_pool] < 1 } {
        HTTP::respond 200 content [ifile get "poolname_MaintenancePage_ifile"] noserver "Content-Type" "text/html" "Cache-Control" "no-cache, must-revalidate"
        return
    }
    HTTP::header insert HttpsIndicatorHeader True
}