title: Glide - adding header to request
body: <p>Is there a method to add a custom header to request when an image is downloaded?
  I can use volley or okhttp in Glide.</p>
  <p>I tried adding a cookie to the cookiemanager in okhttpclient, but it didn't help.</p>
  <p>Is there a method to debug request response in Glide?</p>