setenv("REQUEST_URI", "/~richard/env%2ecgi", 1);
check_string(infer_url(1),
"https://www.anjou.terraraq.org.uk/~richard/env%2ecgi");
setenv("REQUEST_URI", "/~richard/env%2ecgi", 1);
check_string(infer_url(1),
"https://www.anjou.terraraq.org.uk/~richard/env%2ecgi");