Method Call Order for Rendering Flow
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1. IResource::get_response()
2.     IResource::get_content_provider()
3.     IAccessControl::check_access()
4.     IContent::prepare_content()
5.     IContent::get_content_type()
6.     IContent::get_content()
7.         ITemplate::get_template()
8.         ITemplate::get_template_root()