Check http url download file size (qbit)

• foreword

   有些时候下载服务器不响应 head 请求（403）
  例如 AWS S3 预签名的下载文件
  这时候可以尝试用 get steam 获取文件大小

• Example environment

   Python   3.8.10
  requests 2.27.1

• sample code

   >>> import requests
  >>> url = "https://releases.ubuntu.com/22.04/ubuntu-22.04-live-server-amd64.iso"
  >>> requests.head(url).headers["Content-Length"]
  '1466714112'
  >>> requests.get(url, stream=True).headers["Content-Length"]
  '1466714112'

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