A terribly "simple" app which allows for site-branding depending on hostnames or similar.
On the start of the request the middleware parses the request and stores the perceived hostname in a thread-local variable.
The template loader uses this variable to se if there is a folder with the same name as the hostname in SPECIALIZATION_DIR. If such a folder exists, and a template matching template_name is present, that template is loaded, otherwise the request is passed on in the stack of loaders.
This allows for dynamic override of templates based on hostname. The initial idea was to use this for specific site branding.
SPECIALIZATION_DIR - Specifies where to look for folders with templates.
Needs be in MIDDLEWARE_CLASSES. Otherwise the template loader doesn't know which hostnames to load templates for.
Needs to be in TEMPLATE_LOADERS before the "standard" loaders. Otherwise the template will be loaded from the the "standard" locations.