Avoiding http status 200 for non-existing threads

[Evey]

If you visit

https://vborg.vbsupport.ru/showthrea...2#post12600742

you will receive an error message stating "No Mod specified. If you followed a valid link, please notify the administrator". However, the HTTP headers return a status 200.

HTTP/1.1?200?OK(CR)(LF)
Date:?Mon,?04?Jun?2007?22:46:46?GMT(CR)(LF)
Server:?Apache/2.2.4?(Unix)?mod_ssl/2.2.4?OpenSSL/0.9.7a?PHP/5.2.2?mod_perl/2.0.3?Perl/v5.8.5(CR)(LF)
X-boxen:?azure(CR)(LF)
X-Powered-By:?PHP/5.2.2(CR)(LF)
Expires:?0(CR)(LF)
Cache-Control:?private,?post-check=0,?pre-check=0,?max-age=0(CR)(LF)
Pragma:?no-cache(CR)(LF)
Content-Type:?text/html;?charset=ISO-8859-1(CR)(LF)

How can that be turned into a status 404?

[Dismounted]

You would have to add:

PHP Code:

header('HTTP/1.1 404 Not Found'); 


To whenever it would display that message. Not sure if there's a hook somewhere for that.