You are trying to log in to LinkedIn, Facebook, or another major platform. You enter your credentials. You complete the “I am not a robot” challenge—maybe you click the checkbox, or you spend 30 seconds identifying traffic lights and bicycles. You click submit. And then you see it: “Your noCAPTCHA user response code is missing…

You are trying to log in to Facebook, LinkedIn, or another major platform. You enter your credentials. You complete the “I am not a robot” challenge—maybe you click the checkbox, or you spend 30 seconds identifying traffic lights and bicycles. You click submit. And then you see it: “Your noCAPTCHA user response code is missing…