The admin/includes/configure.php also includes
define('HTTP_SERVER', 'http://domain.com');

There is no cert installed on the domain where I'm developing the new site. The htaccess file is a copy of the htaccess file currently being used by the live site (zc 1.5.1) on the same server which also uses USU.

This is what I get using the htaccess rules
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and this is what I get without the htaccess rules
Click image for larger version. 

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