title: MVC: Serve file with http header
body: <p>I am trying to follow <a href="https://documentation.onesignal.com/docs/web-push-sdk-setup-https#section-can-manifest-json-onesignalsdkworker-js-and-onesignalsdkupdaterworker-js-be-served-from-a-subfolder-of-my-site-" rel="nofollow">this</a> guide and store files in a sub-folder. </p>
  
  <p>However, the OneSignal guide asks to serve these files with additional HTTP header <code>Service-Worker-Allowed: /</code>. How do I do that in Asp.Net MVC?</p>