// 栈不为空时才判断（避免访问stack.at(-1)时报错）
This pattern has caused connection pool exhaustion in Node.js applications using undici (the fetch() implementation built into Node.js), and similar issues have appeared in other runtimes. The stream holds a reference to the underlying connection, and without explicit consumption or cancellation, the connection may linger until garbage collection – which may not happen soon enough under load.
，详情可参考51吃瓜
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