title: HAR file - access "Size" column entries from Chrome Dev Tools Network tab?
body: <p>I am working on measuring the percentage of GET requests being handled / returned by a site's service worker. Within Chrome Dev Tools there is a "Size" column that shows "(from ServiceWorker)" for files matched by the cache. </p>
  
  <p><a href="https://i.stack.imgur.com/8pgAi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8pgAi.png" alt="enter image description here"></a></p>
  
  <p>When I right-click on any row and choose "Save as HAR with content" then open up the downloaded file in a text editor, searching for "service worker" includes some results (where within the response, there is "statusText": "Service Worker Fallback Required"), but none of them look related to the fact that some requests were handled by the service worker.</p>
  
  <p>Is this information I'm looking for accessible anywhere within the downloaded HAR file? Alternatively, could this be found out by some other means like capturing network traffic through Selenium Webdriver / ChromeDriver?</p>