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What's the underlying tech that allows browsers to resume file downloads?

Manohar Srinivasa's photo
Manohar Srinivasa
·Oct 10, 2018

How are browsers resuming file downloads? Suppose I'm downloading a large file, I pause it and then resume? What is the underlying HTTP calls to continue the download?

I'm aware of Range Requests, but I've seen cases where the download resumes even when the server doesn't support range requests.