URIs and URLs
Resources on the internet are identified by URIs.
URI¶
Uniform Resource Identifier - a globally unique text string identifying a resource.
The most important kind of internet URI is the URL.
URL¶
Uniform Resource Locator - a URI which also specifies how to locate and retrieve a resource.
In other words, a URL is a subset of the URI, which specifies where a resource is and the mechanism for retrieving it.
URL Examples¶
URLs typically specify an application protocol, followed by a hostname and a path to the resource on that host.
http://www.example.com/content/somepage.html
Login and port information can be included.
ftp://user2:mypass@ftp.example.com/pub/somefile.txt
rtsp://media.example.com:88/videos/somevideo.avi
port¶
An endpoint on a server in a network. Clients connect to ports. Ports are numbered 0 - 65535.
Skill++¶
Another acronym in this conversation is URN, "Uniform Resource Name." URN's must be unique, and be unique forever.