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self.writer.writeheader()
，详情可参考同城约会
第十九条 增值税法第二十二条第三项所称非正常损失，是指因管理不善造成货物被盗、丢失、霉烂变质，以及因违反法律法规造成货物或者不动产被依法没收、销毁、拆除等情形。
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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.