使用http模块实现数据流请求

 //使用数据流形式请求传输网络数据 
streamHttpRequest(url: string) { 
    let httpRequest = http.createHttp(); 
    httpRequest.on("dataReceive", (data: ArrayBuffer) => { 
      console.info("dataReceive length: " + JSON.stringify(data.byteLength)); 
    }); 
    httpRequest.on("dataEnd", () => { 
      console.info("Receive dataEnd !"); 
    }); 
    httpRequest.on("dataReceiveProgress", (data: RequestData) => { 
      console.info("dataReceiveProgress:" + JSON.stringify(data)); 
    }); 
  
    httpRequest.requestInStream(url, (err: BusinessError, data: number) => { 
      if (!err) { 
        console.info("requestInStream OK! ResponseCode is " + JSON.stringify(data)); 
      } else { 
        console.info("requestInStream ERROR : err = " + JSON.stringify(err)); 
      } 
    }) 
  
  
    httpRequest.off("dataReceiveProgress"); 
    httpRequest.off("dataEnd"); 
    httpRequest.off("dataReceive"); 
  
  }
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