title: Bitbucket new webhook not working
body: <p>Bitbucket has improves its <em>Webhooks</em> functionality. We won't be able to create POST or Pull Request POST in <em>Services</em>, instead in <em>Webhooks</em>.</p>
  
  <p>So I have tried to create POST request to Slack using new <em>Webhook</em>, but it doesn't work. Clicked on <code>View requests</code>, I got 500 error on the request. While with the same URL, it works in <em>Services</em>.</p>
  
  <p>I don' know what I did wrong. Bitbucket documentation doesn't help. Can someone please help me?</p>