Difference between URL and URI?

2018-06-03 13:56:11

Possible Duplicate:
What's the difference between a URI and a URL?

Just to get it right:

URI = Tells you in which hotel you should go to sleep.

URL = Tells you in which room in what hotel you should go to sleep.

So URL is a lot more specific, it points to a final destination. The thing you want. While URI is something strange.

So what exactly is URI when it's not an URL? What's the real difference?

URI: Uniform Resource Identifier (URI) is a string of characters used to identify a name or a resource on the Internet. Such identification enables interaction with representations of the resource over a network (typically the World Wide Web) using specific protocols

URL: In computing, a Uniform Resource Locator (URL) is a subset of the Uniform Resource Identifier (URI) that specifies where an identified resource is available and the mechanism for retrieving it.

Example

To identify a specific resource and how to access it - in all completeness

URI: mysql://localhost@databasename:password

The URL shows you where you can find the database on the internet and which protocol you should use.

URL: mysql://localhost

“URI代表统一资源标识符（Universal Resource Identifier），URL代表统一资源定位符（Universal Resource Locator），通常人们可互换地使用术语，这并不完全正确，URL是URI流行协议的一个子集，它们是协议（http：//，ftp ：//，mailto :)。因此，所有的URL都是URI，术语URL是不推荐使用的，在技术文档中使用的术语URI更为正确。所有URI都是访问Internet上资源的手段，并且是一种技术手段链接到资源URIs总是指定一种方法来访问资源并指定要访问的特定资源。“ - 来源

这是一个URN，它可以识别一个物品而不给任何位置。

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