title: Listen for POST event with specific content using pure JavaScript
body: <p>I've got a scenario where an AngularJS site is not loading any jQuery (aside from the inclued jQLite) and I need to listen for events with specific parameters.</p>
  
  <p>I can't edit any of the source, but the event in the dev console shows that it is a POST event to a specific URL: <a href="https://example.com/ajax/leadgen" rel="nofollow">https://example.com/ajax/leadgen</a></p>
  
  <p>And I need to listen for when this POST event contains specific parameters like:
  leadType =  25
  pageID = abcd</p>
  
  <p>I've been looking into various options using addEventListener but I can't figure out how to apply that to this scenario.</p>