Yobi supports smart http protocol but not dumb http protocol.
kjkmadness said we can believe v1.6.6 supports smart http protocol
because of some mentions as below.
From http://git-scm.com/blog/2010/03/04/smart-http.html
> Before version 1.6.6, Git clients, when you clone or fetch over HTTP
> would basically ...
From https://raw.github.com/git/git/master/Documentation/RelNotes/1.6.6.txt
> "git fetch" over http learned a new mode that is different from the
> traditional "dumb commit walker"
From https://github.com/blog/642-smart-http-support
> Git supports a new, much more efficient HTTP based transport as of
> version 1.6.6
