URI, URL 和 URN區別
阿新 • • 發佈：2018-10-11
cal because orm 給定 直接 site ons ESS 訪問
參考：https://danielmiessler.com/study/url-uri/
URN： A Uniform Resource Name，統一資源名稱 ；eg. ietf.org/rfc/rfc2396.txt（給定URI，我們仍無法訪問該資源，因為我們不知道是在http協議還是ftp協議亦或者是其他協議）
URL：Uniform Resource Locator，統一資源定位符；eg. http://www.ietf.org/rfc/rfc2396.txt (可以定位資源的地址，即給定URL，我們就能找到這個資源)
URI：Uniform Resource Identifier，統一資源標識符。One can classify URIs as locators (URLs), or as names (URNs), or as both. A Uniform Resource Name (URN) functions like a person’s name, while a Uniform Resource Locator (URL) resembles that person’s street address. In other words: the URN defines an item’s identity, while the URL provides a method for finding it。即：URN和URL都是URI的子集. 所以任何的URN和URL都可以稱之為URI。
Summary:
- URIs are identifiers, and that can mean name, location, or both.（URI既可以是資源名字，也可以是資源定位符，或者兩者都是）
- All URNs and URLs are URIs, but the opposite is not true.（URN和URL都是URI，但反之不成立）
- The part that makes something a URL is the combination of the name and an access method, such as
https://, ormailto:.（URL是由名字和訪問方式（訪問協議）組成的） - All these bits are URIs, so saying that is always technically accurate, but if you are discussing something that’s both a full URL and a URI (which all URLs are), it’s best to call it a “URL” because it’s more specific.（專業來說，直接用URI總是正確的，但如果是屬於URL範疇的URI，直接使用URL這種稱呼會更精確，因為URL是一個更小集合。）
URI, URL 和 URN區別