bug: 502 status code is not failing

config:

  - type: site
    url: https://rancher.theshell.co.jp
    expect:
      responseCode: 401
      contentType: 'application/json'
    timeout: 8.0

Current result:

 - #8 http test for https://rancher.theshell.co.jp:  OK! 502  IP: 106.187.39.71                                                                                                                                     

Expected result: Fail, 502 != 401