Workaround

[stwissel]

This workaround seems to do the trick for the time being:

			if ($request_method = HEAD) {
					add_header Content-Length 0;
					add_header Content-Type text/plain;
					add_header Vary Accept-Encoding;
					return 200;
			}

It might interfere with other HEAD requests, so I consider that as stopgap
measure

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,255845,255865#msg-255865