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.
It is possible to disable the automatic update service if you prefer to manage updates manually.。爱思助手下载最新版本对此有专业解读
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（四）代替他人或者让他人代替自己参加考试的。