Apache returns 400 instead of 200 at DocumentRoot

This suggests you have other problems with your configuration. There's the hint that TransferLog logs/ssl_access_log -directive is inside a virtual host definition, and the rotated log is not. As the ssl_access_log logs authenticated user and rotated log doesn't, I'd guess that the service rotated log is applied to doesn't actually have any authentication configured.

Other thing is that these logs are actually recording two different http requests. The request in rotated log has got a 302 response, a redirect to somewhere else. The request in ssl_access_log got a 404, a not found response. It is possible that the other request is a consequence of browser getting the 302, and then attempting to get it from the other place, but it could also be something else.

In short, these logs are logging different virtual hosts. The cause of redirection could be your server's canonical name setting, rewrite rules or something else, with this information it's impossible to say.

Maybe you want to read http://wiki.apache.org/httpd/ProxyAbuse

specially this point: "My server is properly configured not to proxy, so why is Apache returning a 200 (Success) status code?", it asks your question "Shouldn't that be a 404 response, not a 200!?"

If apache conf is ok, its just sending root page. It's the reason because you get a status code is 200.