When the config.php is missing at all, a 302 http redirect to install/index.php?install/ appears with http code 200 whether the data folder is writeable or whether the data folder exists at all. To be honest, the data folder is in fact gone. It is not needed with my setup. But I would love to see some other error message like "the configuration file is missing or I can not read it" and tell the client that the actual web page is not only a redirected 200, but there's a server error and the audience is not getting what it wanted in the first place (a forum page). Maybe "Internal Error 500" [The server encountered an unexpected condition which prevented it from fulfilling the request].