:scheme and CONNECT method

Hi,

draft-05 says that :scheme MUST be present in HTTP request.
If client sends to CONNECT method to the middle box, which value
should be sent as :scheme? http?
For the reference, the current SPDY proxy (aka secure proxy) omits
:scheme. For example, CONNECT to remote example.org:443 via
proxy, chrome sends the followings:

:method => CONNECT
:host => example.org
:path => example:org:443
:version => HTTP/1.1

:version is not omitted in HTTP/2.0, so it can be ignored.

Best regards,

Tatsuhiro Tsujikawa