title: How do I pass post parameters in react native WebView?
body: <p>I have a url I want to open in my app using <code>WebView</code> to avoid the user having to be redirected out of the app to the mobile browser. However the the web page I want to show requires some post parameters like from a post form. If it was a GET situation I woul'd have simply appended the parameters to the url. </p>
  
  <pre><code>&lt;WebView
      source={{uri: 'https://mypage.com/index.php', headers: '---', body: '---'}}
      style={{marginTop: 20}}
    /&gt;
  </code></pre>
  
  <p>Do I put them in <code>headers</code> or in <code>body</code>, and in what format? Or is there another way? I would like to have the parameters in a key value format i.e <code>cat=himalayan&amp;dog=pug&amp;fish=shark</code></p>