单选题

下面哪种操作不属于跨域

Question

A. http://www.123.com/index.html 调用 http://www.456.com/server.php

B. http://www.123.com/index.html 调用 https://www.123.com/server.php

C. http://www.123.com:8080/index.html 调用 http://www.123.com:8081/server.php

D. http://www.123.com/index.html 调用 http://www.123.com/server.PHP