you can't read urls like this (imread/cvLoadImage only accept a local path)
please avoid the old c-api(IplImages, cv*Functions), support for that will end soon.
you could try to abuse VideoCapture for this:
Mat frame;
VideoCapture cap();
cap("http://carprotectionsystem.webuda.com/m012_full_body0000_2.jpg");
if ( cap.isOpened() )
cap.read(frame);cap.read(frame);