Example:
access:
http://git.wikimedia.org/blob/mediawiki%2Fextensions%2FSemanticMediaWiki.git/master/COPYING
clicking "raw" link takes me to:
http://git.wikimedia.org/raw/mediawiki/extensions/SemanticMediaWiki.git/master/COPYING
which generates
` Error Sorry, the repository mediawiki does not have a extensions branch! `