title: forbidden 403 on image URLS
body: <p>I'm developing a web app using Angular5. I have a database that has some "posts" and each post contains an image URL that I take from 4chan API. 
  The URL is legit (If I check it manually it works) but I get 403 forbidden in my console when I debug in the web browser. another weird thing, if I go to the URL manually and then refresh my app, the image is suddenly shown.</p>
  
  <p>example URL : <code>"http://i.4cdn.org/lgbt/1521711096067.jpg"</code></p>