Split serving of computer code

A computer system comprising:

• one or more hardware processors;
• at least one memory coupled to the one or more hardware processors and storing one or more instructions which, when executed by the one or more hardware processors, cause the one or more hardware processors to:
• identify that a request has been made by a client computing device for serving of content from the content server system;
• serve, to the client computing device and for execution on the client computing device, reconnaissance code that is programmed to generate information for determining whether the client computing device is human-controlled or bot-controlled;
• receive, from the reconnaissance code, data that indicates whether the client computing device is human-controlled or bot-controlled;
• determine that the client computing device is bot-controlled based on the data;
• and
• in response to determining that the client computing device is bot-controlled, serve, to the client computing device, follow-up content comprising fake code that is not the content from the content server system.