AWS SDK Ruby

Aws::Errors::MissingRegionError
Aws::Errors::MissingCredentialsError (unable to sign request without credentials set). In aws sdk version 2:

    Aws.config = {
      region: 'us-east-1',
      credentials: Aws::Credentials.new(ENV['AWS_ACCESS_KEY_ID'], ENV['AWS_SECRET_ACCESS_KEY'])
    }