title: Vary: Accept-Encoding Response Header
body: <p>I am trying to understand the response Header "Vary: Accept-Encoding".</p>
  
  <p>I am noticing the response header "Vary: Accept-Encoding" appears for some of the images in the developer tools for our application, but some images doesn't have this response header. </p>
  
  <p>When i tried to hit same image url in the browser, not seeing this header "Vary: Accept-Encoding".</p>
  
  <p>Why this header appears only for selected images in our application? What could be possibilities?</p>