https://httpdragons.com/404.png
Specify width, height will adapt automatically
https://httpdragons.com/404.png?w=500
Specify height, width will adapt automatically
https://httpdragons.com/404.png?h=500
Specify height and width
https://httpdragons.com/404.png?w=500&h=200
https://httpdragons.com/404.json