如何发送字节流数据 ？

async octet_request() { 
  // 上传ArrayBuffer 
  let uploadData = "108,109,110"; 
  let splitArr = uploadData.split(",") 
  let uArr = new Uint8Array(splitArr.length) 
  splitArr.forEach((value, index) => { 
    uArr[index] = parseInt(value) 
  }) 
 
  let result = await http.createHttp().request("http://139.196.175.126:7087/file/upload2", { 
    method: http.RequestMethod.POST, 
    header: { "Content-Type": 'application/octet-stream;charset-utf-8' }, 
    extraData: uArr.buffer, 
  }) 
  console.log("uploadLog === " + result.result as string) 
}