title: Error: connect EINVAL 0.0.xx.xx:80 - Local (0.0.0.0:0)
body: <p>I'm trying to use hubot msg object to send http request, but finally get this error:
  Error: connect EINVAL 0.0.xx.xx:80 - Local (0.0.0.0:0)</p>
  
  <p>A similar question is saying this is caused by hosts file, but no detail.</p>