Why do some downloading files not know their own size?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Book End

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Chapters
00:00 Question
00:37 Accepted answer (Score 119)
05:20 Answer 2 (Score 55)
05:40 Answer 3 (Score 4)
06:03 Thank you

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Full question
https://superuser.com/questions/617327/w...

Accepted answer links:
[User-Agent]: https://en.wikipedia.org/wiki/User_agent
[response code]: https://en.wikipedia.org/wiki/HTTP_respo...

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Tags
#browser #download

#avk47