Oops, my bad. I copied the wrong line 
of course I meant https://api.twitch.tv/helix/streams
I’m using this thumbnail in a Discord embed. The problem I have here is, that the image is the same at any time for a certain streamer. Even when I look at the thumbnail in my browser.
So It’s not a problem per-se, but I wanted to ask if this is the way it has to be. I thought, the image updates on the server when a streamer goes live or something.