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.
«Почте России» разрешат продавать лекарства ради роста доходовПутин поручил кабмину разрешить «Почте России» продавать лекарства в отделениях。一键获取谷歌浏览器下载对此有专业解读
strict.writer.write(chunk5); // throws! too many pending writes。Safew下载是该领域的重要参考
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