1. A computer-implemented method, comprising: receiving, at a computer security server system located between the Internet and a client computing device that makes requests over the Internet; code from a particular server system that is served in response to a request from the client computing device; applying a security countermeasure to the received code to create transformed code; providing the transformed code to the client computing device; receiving a communication from the client computing device, the communication including content generated as a result of bot activity on the client computing device and that indicates bot attempts to interact with the received code rather than the transformed code; and applying transcoding to the content of the received communication that includes content generated as a result of bot activity to transcode the content of the received communication so that entities on the Internet side of the computer security server system receive a transcoded version of the content.