title: Correct Content-Type for a webhook I'm sending using POST
body: <p>I'm working on a platform that sends webhooks for several events.</p>
  
  <p>We're sending a JSON string as the value of the <code>payload</code> parameter in a POST request to the user defined webhook URL.</p>
  
  <p>For the <code>Content-Type</code> header should we be using:</p>
  
  <ul>
  <li><code>application/x-www-form-urlencoded</code> or</li>
  <li><code>application/json</code></li>
  </ul>
  
  <p>The JSON object can contain any (UTF-8 encoded) unicode string including custom data served beforehand by the user, so we're not controlling it.</p>