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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Again, it depends on the context. If it’s for a one-off event with a lot of people you don’t know, there’s probably no need.。safew官方版本下载是该领域的重要参考
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