title: Configure codeigniter on a subdomain
body: <p>Hi everyone, 
      I've been having issues with accessing a codeigniter site.
      I uploaded on my sub domain. Pls i need your help. I have a domain called<code>www.mydomain.com</code> and a sub-domain called<code>www.app.mydomain.com</code>.
      I uploaded a CI site to<code>www.app.mydomain.com</code>.
      What changes do i need to make to config file of the CI to access this site in my sub-domain. presently i got <code>ERROR 404</code>.
      Pls I need an example to follow. Thanks</p>