title: Workbox Request method 'POST' is unsupported
body: <p>I am using the code from this site: <a href="https://developers.google.com/web/tools/workbox/modules/workbox-routing" rel="noreferrer">https://developers.google.com/web/tools/workbox/modules/workbox-routing</a></p>
  
  <p>My code is as below: </p>
  
  <pre><code>workbox.routing.registerRoute(
    new RegExp('http://localhost:64445.*/'),
    workbox.strategies.staleWhileRevalidate({
      cacheName:'Post-Run-time-cache'
    }),
    'POST'
  );
  </code></pre>
  
  <p>And it gives me the error: </p>
  
  <pre><code>Uncaught (in promise) TypeError: Request method 'POST' is unsupported
  </code></pre>
  
  <p>I do not know what went wrong. It is from the document but it is not supported?? why. Thanks for the help. </p>