HarmonyOS rcp 组件 fetch 接口如何流数据输出数据？

const customHttpEventsHandler: rcp.HttpEventsHandler = { 
  onDataReceive: (incomingData: ArrayBuffer) => { 
    // Custom logic for handling incoming data 
    console.info("Received data:", incomingData); 
    return incomingData.byteLength; 
  },
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