def self.get_api_version(uri, connection_options = {})
connection = Fog::Core::Connection.new(uri, false, connection_options)
response = connection.request(:expects => [200],
:headers => {'Content-Type' => 'application/json',
'Accept' => 'application/json'},
:method => 'GET')
body = Fog::JSON.decode(response.body)
version = nil
unless body['version'].empty?
version = body['version']['id']
end
if version.nil?
raise Fog::OpenStack::Errors::ServiceUnavailable, "No version available at #{uri}"
end
version
end