Disable keepalive

Which causes problems when our trivial loggers are used
where delay between messages cannot be predicted (e.g. testing)

cgi-bin/htlog/htlog.cgi

@@ -52,7 +52,8 @@ my $out = "Message logged: $msg\n";
 print $q->header(
     -type               => 'text/plain',
     -expires            => 'now',
-    -content_lentgth    => length $out
+    -content_lentgth    => length $out,
+    -connection         => 'close'
 );
 
 print $out;