摘要：
之前只模糊的记得URL是URI的子集，今天看了个链接总算清楚了。链接http://www.bernzilla.com/item.php?id=100"URI stands for Universal Resource Identifier and URL stands for Universal Resource Locator. Often times people use the terms interchangably, which is not entirely correct. A URL is a subset of the URI popular protocols. 阅读全文
