title: Null Form Data Post WKWebView
body: <p>I have no idea for null <code>form data</code> in WKWebView for first loading in 2 requests:</p>
  
  <ol>
  <li><strong>Got redirect</strong> from another website with request to <code>doku_payment/redirect</code> with <code>form data</code> (<strong>null</strong>, POST method) and then
  redirect to second request</li>
  <li>Request to <code>salesorder/xxxxxx</code></li>
  </ol>
  
  <p>I run in Chrome Desktop is fine, like on picture:
  <a href="https://i.stack.imgur.com/K3X5l.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/K3X5l.png" alt="enter image description here"></a></p>
  
  <p>In WebView Android is fine for loading the requests.</p>
  
  <p>How can I solve the problem?</p>
  
  <p>env:
  Xcode v. 10.0</p>