Handle auth 503 error (early access has expired)

[aceforwin]

Request returns with 503 status code if early access has expired.

rc.json() will raise JSONDecodeError

[oczkers]

Hi, thanks for Your first contribution! 503 is general error code for service unavailable so it could be possible raised in many situations, could You explain to me what exactly does it mean by "early access has expired"?

[vinch1n]

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