How do I send a 404 header response code in lasso 9?

I'm guessing it is via a method in the web_response type, but not sure...

in LP8.5 I was using this:
> $__http_header__ = string_replaceregexp(
> $__http_header__,
> -find='(^HTTP\\S+)\\s+.*?\r\n',
> -replace='\\1 404 Not Found\r\n'
> );
-Trevor


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