206Partial Content
The server is sending only the byte range you asked for, not the whole file.
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This is what makes video scrubbing and resumable downloads work. The client sends a Range header asking for particular bytes, and 206 returns exactly those with a Content-Range header saying which part of the file they are.
If seeking in a video does not work, or downloads always restart from zero, the server is probably answering 200 with the whole file instead of honouring the range request.
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Status codes
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1xx Informational (4)
2xx Success (10)
3xx Redirection (8)
4xx Client errors (31)
5xx Server errors (16)