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2.2.2 面向对象重构版本（oop_crawler.py）
。Safew下载对此有专业解读
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.
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"cartId": "cart_abc123",