HTTP::respond - bug or improper use?

The significant difference is that I am doing the redirect in the HTTP_RESPONSE event, and also setting cookies, for a server response that sets a particular header...

when HTTP_RESPONSE {
if { [HTTP::header exists "status"] } {
switch [HTTP::header value "status"] {
"OK" {
HTTP::respond 302 Location "https://$HOSTNAME$URI" "Set-Cookie" $MY_COOKIE
return
}
... other cases ...
default {

}
}
}
}

The switch case works fine, but the HTTP::respond does not. I have tried hard coding the Location value and cookie value strings, but it makes no difference.