Nginx image_resize - what could be wrong?

Question

Nginx

I set in config

server_name example.com;
        location /img/ {
             root   /var/www/;
             image_filter   resize  150 100;
             error_page     415   = /50x.html;
        }

Images are in /var/www/
Go to example.com/img/mypic.png
Gives 415 (Unsupported Media Type)
nginx built with --with-http_image_filter_module
What could be wrong?

Answer 1

Alternatively https://monosnap.com/image/iBK4XxiRygr8hWpbOaHDDeL...