发送字节流数据（application/octet-stream）

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) 
  }