disable http 1.1 not working with iRules

If your problem is on the client side, you are better off using the following:

when HTTP_RESPONSE {
    HTTP::version "1.0"
    if {[HTTP::header exists "Transfer-Encoding"]} {
        HTTP::payload unchunk
        HTTP::header remove "Transfer-Encoding"
    }
}

; if your problem is on the server side, you should not use the OneConnect profile, and you can use:

when HTTP_REQUEST_SEND {
    HTTP::version "1.0"
}