return None when secure-cookie is forged: https://github.com/facebook/tornado/commit/1ca245f0ee0d5785610e5bf90b78e3860adc9deb
return None when secure-cookie is forged: https://github.com/facebook/tornado/commit/1ca245f0ee0d5785610e5bf90b78e3860adc9deb

dpnova/cyclone,lextoumbourou/cyclone,dpnova/cyclone,lextoumbourou/cyclone,fiorix/cyclone,dpnova/cyclone,fiorix/cyclone,dpnova/cyclone,fiorix/cyclone,lextoumbourou/cyclone