（一）包含两个以上涉及不同税率、征收率的业务；
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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.
Maxim Konovalov Co-founder, Nginx，更多细节参见旺商聊官方下载