# File lib/webmock/http_lib_adapters/httpclient_adapter.rb, line 229
  def auth_cred_from_headers(headers)
    headers.each do |k,v|
      next unless k =~ /[Aa]uthorization/
      return v if v.is_a?(String) && v =~ /^Basic /
      v.each { |v| return v if v =~ /^Basic / } if v.is_a? Array
    end
    nil
  end