What does the HTTP 206 Partial Content status message mean and how do I fully load resources?

From user166390’s answer to the question Why does Firebug show a “206 Partial Content” response on a video loading request?

This Partial Content code (206) may be sent from the server when the client has asked for a range (e.g. “give me the first 2MB of video data”).

It is vital for downloading data in chunks which avoids fetching unused resources. (I seldom watch a full video online.) Look at the outgoing request for a Range header.

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