URI.

最新推荐文章于 2021-07-22 22:09:10 发布

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最新推荐文章于 2021-07-22 22:09:10 发布

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原文链接：http://www.cnblogs.com/listened/p/3774038.html

本文介绍了统一资源标识符（URI）的基本概念，包括其特性如统一性、所指资源的定义以及URI与URL、URN之间的区别。强调了URI在不同场景下的一致性和可扩展性。

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Overview of URI

URI are characterized by the following definitions:

Uniform

Uniformity provides several benefits:
　　it allows different types of resource identifiers to be used in the same context, even when the mechanisms used to access those resources may differ;
　　it allows uniform semantic interpretation of common syntactic conventions across different types of resource identifiers.
　　it allows introduction of new types of resource identifiers without interfering with the way that existing identifiers are used.
　　it allows the identifiers to be reused in many different contexts.

Resource
　　A resource can be anything that has identity.including an electronic document, an image, a service (e.g., "today's weather report for Los Angeles"), and a collection of other resources.

URI, URL, and URN

　　A URI can be further classified as a locator, a name, or both.  The
   term "Uniform Resource Locator" (URL) refers to the subset of URI
   that identify resources via a representation of their primary access
   mechanism (e.g., their network "location"), rather than identifying
   the resource by name or by some other attribute(s) of that resource.
   The term "Uniform Resource Name" (URN) refers to the subset of URI
   that are required to remain globally unique and persistent even when
   the resource ceases to exist or becomes unavailable.


ref:http://www.ietf.org/rfc/rfc2396.txt