Git Raw URL

[reviewboard]

Just completed setting up gitweb and reviewboard. The raw URL format (from the
docs) did not work. Git repos are on a different server than reviewboard and
are access controlled via gitolite. gitweb installed on the git repo server
and runs with file system read access to the git repos. to test, manual diff
created 'git diff --full-index' and manually uploaded via reviewboard website.

did not work:
http://servername/?p=relative path to git
repo;a=blob_plain;f=<filename>;hb=<revision>

the above raw URL returns: 404 - cannot find file when creating new RB record

did work (change hb= to h=):
http://servername/?p=relative path to git
repo;a=blob_plain;f=<filename>;h=<revision>

the above raw URL worked, review created and can view diff in reviewboard

Is this legit or did I setup something wrong that lead to this situation?