The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
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How to prepare for storms and cope with bad weather
Not the day you're after? Here's the solution to yesterday's Connections.，更多细节参见91视频