webthing/server.py
def prepare(self):
        """Validate Host header."""
        host = self.request.headers.get('Host', None)
        if host is not None and host in self.hosts:
            return

        raise tornado.web.HTTPError(403)
def prepare(self):
        """Validate Host header."""
        host = self.request.headers.get('Host', None)
        if host is not None and host in self.hosts:
            return

        raise tornado.web.HTTPError(403)
Validate Host header.