url: http://www.pagepilot.co.uk/pp_cftest/
When posted into facebook debugger: https://developers.facebook.com/tools/debug/og/object?q=http%3A%2F%2Fwww.pagepilot.co.
The debugger only requests the first 40KB of your page - so the 206 is expected (well, it's expected if only part of the document was returned but i guess some servers return it for any request with a Range:
header)
It shouldn't affect your ability to have the tags read correctly and the metadata populated when sharing a link on Facebook