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Editorial Team
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Asked: 2026-05-26T04:55:18+00:00

I found an interesting issue that confused me. I noticed it when I use

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I found an interesting issue that confused me.

I noticed it when I use a Chrome to download files from the Internet.

For some kind of files, like this one, the Chrome download bar will remind you the total size of the file and the remaining time to download it.

However, for some other kind of files, like this one, the chrome download bar will not remind the total size and the remaining time.

So why is there such difference?

I guess it has something with the HTTP or HTTPS protocol, am I right?
But I do not know how to explain this in this point of view.

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1 Answer

  1. Editorial Team

    The first one has this HTTP header:

    Content-Length: 19162507

    The second one does not have the Content-Length header, and so the browser cannot show the download percentage.

    You can view HTTP headers with curl on the command line:

    curl -I http://www.stanford.edu/class/ee368/Handouts/1-Introduction_March28.pdf
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