How to get size file in a link?

I need to download a file on the internet, I use QNetworkManager and QNetworkReply. How do I know which file to download with size is?

Use

Code:

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header(QNetworkRequest::ContentLengthHeader)

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on your QNetworkReply. You will get content-length.

If you need to, you can issue a HEAD request to retrieve the headers without actually receiving the content. There may be a "Content-Disposition:" header (see RFC 2183) that contains the server's recommended file name.