insert HTTP Header after

Gotcha, how about something like...

when HTTP_REQUEST {
if {[HTTP::header "Accept"] contains "application/json"}{
foreach aHeader [HTTP::header names] {
set hValue [HTTP::header value $aHeader]
if {$aHeader == "Accept"}{
HTTP::header remove $aHeader
HTTP::header insert $aHeader $hValue
HTTP::header insert "New-Header" "New-Header-Value"
} else {
HTTP::header remove $aHeader
HTTP::header insert $aHeader $hValue
}
}
}
}