How do I seek to a particular position on a remote (HTTP) file so I can download only that part?

Lets say the bytes on a remote file were: 1234567890

I wanna seek to 4 and download 3 bytes from there so I would have: 456

and also, how do I check if a remote file exists? I tried, os.path.isfile() but it returns False when I'm passing a remote file url.

python http seek
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