The HTTP 2xx class of status codes indicates the action requested by the client was received, and processed successfully. HTTP/1.1 200 OK is the standard response for successful HTTP requests. When you type www.cyberciti.biz in the browser you will get this status code. The HTTP/1.1 206 status code allows the client to grab only part of the resource by sending a range header. This is useful for:

1. Understanding http headers and protocol.
2. Troubleshooting network problems.
3. Troubleshooting large download problems.
4. Troubleshooting CDN and origin HTTP server problems.
5. Test resuming interrupted downloads using tools like lftp or wget or telnet.
6. Test and split a large file size into multiple simultaneous streams i.e. download a large file in parts.

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