BIG-IP : http profile : insert multiple headers

You must use an iRule to insert more than one I believe. To do it with an iRule you can do something simple like this:

when HTTP_REQUEST {
    HTTP::header insert [list X-Forwarded-Proto http header2 value2 headerN valueN]
}

https://devcentral.f5.com/wiki/iRules.HTTP__header.ashx