What is an HTTP Protocol Mismatch in bot detection?

HTTP Protocol Mismatch is one of the checks BotRefund uses to spot automated traffic. It looks for a mismatch that a real browsing session does not normally create, such as proxy rotation, location masking, or browser spoofing. A normal visitor's connection, location, language, and timing usually agree with each other. When those network facts disagree, it becomes evidence for a bot verdict.