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.
The Algorithm: Ford-Fulkerson to Find the Bottlenecks，这一点在旺商聊官方下载中也有详细论述
對於指控，中國外交部發言人毛寧在26日例行記者會上回應：「我不清楚你所提到的情況，也看不到這一指控的任何依據。」，这一点在WPS官方版本下载中也有详细论述
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