Retrieve an application for a wsgi environ

        :param environ: The environ object sent by wsgi to an application

def get_application(self, environ):
        """ Retrieve an application for a wsgi environ

        :param environ: The environ object sent by wsgi to an application
        """
        host = self._get_host(environ)
        subdomain = self._extract_subdomain(host)
        return self._get_application(subdomain)