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While downloading certain files on Google Chrome, the file size is displayed the moment the download begins. For some others, the file size is never displayed until the entire file finishes downloading.

In what cases does this happen ? And why?

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This is perhaps due to a missing "Content-Length" header in the HTTP response from the server, i.e. the server doesn't tell the browser how big the downloaded file will be, so the browser can't display a progress bar or the target file size.

This is no error because the Content-Length header is optional, so there is nothing to worry about and nothing you could do about this.

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