Scaling the Let's Encrypt rate limits to prepare for a billion active TLS cert

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altairprime · 2d ago

> Conveniently, the difference between the TAT and the current time can then be returned to the subscriber in a Retry-After header, informing their client exactly how long to wait before trying again.

I hope they know to add in a small amount of anti-synchronization randomness to the exactly-calculated “retry-after” delay.

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Scaling the Let's Encrypt rate limits to prepare for a billion active TLS cert

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