Works for me with Apache.

test.cgi:

#!/usr/bin/perl
print "Status: 404 Not Found\n";
print "\n";
[download]

access log:

xx.xx.xx.xx - - [17/Jan/2007:17:56:39 -0500] "GET /test.cgi HTTP/1.1" 
+404 - "-" "Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8.1.1
+) Gecko/20061204 Firefox/2.0.0.1" www.example.com
[download]

I can even return an HTML message.

test.cgi:

#!/usr/bin/perl
print "Status: 404 Not Found\n";
print "Content-Type: text/html\n";
print "\n";
print "<title>404 Not Found</title>\n";
print "<h1>404 Not Found</h1>\n";
[download]

access log:

xx.xx.xx.xx - - [17/Jan/2007:18:00:15 -0500] "GET /test.cgi HTTP/1.1" 
+404 52 "-" "Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8.1.
+1) Gecko/20061204 Firefox/2.0.0.1" www.example.com
[download]

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