“There’s literally an error code in the HTTP Protocol that goes all the way back to the early nineties,” he says, loading the protocol spec on w3.org. It’s a stark, barren, HTML-era webpage. He scrolls down it until landing on Error Code 402: “It’s called, ‘Payment required.’”
Unlike the other client error codes, there’s no description of a hypertextual function beneath 402-Payment Required. Instead, there’s an intriguing note: This code is reserved for future use.
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