title: How to exclude url in workbox runtime caching?
body: <p>I am using workbox-build for Gulp in my django project. All works correct, but there are some problems with admin urls. As I see, /admin/* urls caching in runtimes - I can see them in Chrome DevTools/Application/Cache. How can I exclude admin urls from runtime caching?</p>
  
  <p>gulp.js:</p>
  
  <pre><code>gulp.task('service-worker', () =&gt; {
     return workboxBuild.injectManifest({
           globDirectory: '/var/www/example.com/',
           swSrc:  '/var/www/example.com/core/templates/core/serviceWorker/sw-dev.js',
           swDest: '/var/www/example.com/core/templates/core/serviceWorker/sw.js',
           globPatterns:['**/*.{html,js,css,jpg,png,ttf,otf}'],
           globIgnores: ['admin\/**','media\/**','core\/**','static/admin\/**','static/core/scripts/plugins/**']
           }).then(({count, size, warnings}) =&gt; {
           });
  </code></pre>
  
  <p>sw.js:</p>
  
  <pre><code>importScripts("https://storage.googleapis.com/workbox- cdn/releases/3.4.1/workbox-sw.js");
  workbox.precaching.precacheAndRoute([]);
  workbox.googleAnalytics.initialize();
  workbox.routing.registerRoute(
  workbox.strategies.cacheFirst({
  // Use a custom cache name
  cacheName: 'image-cache',
  plugins: [
    new workbox.expiration.Plugin({
      // Cache only 20 images
      maxEntries: 30,
      // Cache for a maximum of a week
      maxAgeSeconds: 7 * 24 * 60 * 60,
      })
     ],
    })
  );
  
  workbox.routing.registerRoute(
      /.*\.(?:ttf|otf)/,
      workbox.strategies.cacheFirst({
      cacheName: 'font-cache',
      })
  );
  
  workbox.routing.registerRoute(
    new RegExp('\/$'),
    workbox.strategies.staleWhileRevalidate()
  );
  
  workbox.routing.registerRoute(
    new RegExp('contacts\/$'),
    workbox.strategies.staleWhileRevalidate()
  );
  workbox.routing.registerRoute(
    new RegExp('pricelist\/$'),
    workbox.strategies.staleWhileRevalidate()
  );
  </code></pre>