in lib/aws/session_store/dynamo_db/configuration.rb [193:199]
def gen_dynamo_db_client
client_opts = { user_agent_suffix: " aws-sessionstore/#{VERSION}" }
client = Aws::DynamoDB::Client
dynamo_db_client = @options[:dynamo_db_client] || client.new(client_opts)
{:dynamo_db_client => dynamo_db_client}
end