fpo: a dummy image server.
Requests are parsed: http://mydomain:4000/[height]x[width]/[color] [color] can be either: hex value for the desired color, 'random', or omitted for a standard gray.
examples: http://mydomain:4000/200x300/ffffaa http://mydomain:4000/100x400/random http://mydomain:4000/250x3000/