remove http::header

I have tryed to make an iRule, witch shoul remove some http::headers in the responce.

when HTTP_RESPONSE {

  foreach header {"P3P" "p3p" "Server"} {

    HTTP::header remove $header

  }

}

the "Server" header is removed, witch indicates the iRule works... BUT the "P3P" is not ??

is it actual the LTM witch is setting the p3p header ? and why

is there any other way to remove it ?

it is actual present too times in the respond :

1. Last-Modified: Mon, 02 Mar 2020 14:56:00 GMT
2. P3P: CP="{}"
3. P3P: CP="{}"