class ElasticAPM::Transport::Headers

def build!(headers)
  headers[:'User-Agent'] = UserAgent.new(@config).to_s
  if (token = @config.secret_token)
    headers[:Authorization] = "Bearer #{token}"
  end
  if (api_key = @config.api_key)
    headers[:Authorization] = "ApiKey #{api_key}"
  end
  headers
end