Uniform resource identifier (URI) and URL
Web Science[1]
Students will be expected to not only define, but also discuss the characteristics of URL and URI. Students will also be expected to describe the purpose of a URL.
Characteristics of a URL[edit]
A Uniform Resource Locator (URL), is a reference to a web resource that specifies its location on a computer network and a mechanism for retrieving it. A URL is a specific type of Uniform Resource Identifier (URI).[2]
- URL's have different parts. Every URL MUST have:
- scheme and host
- URL's have different parts. Every URL MIGHT have:
- user information
- port
- query
- fragment
Please click here for an example of these different parts. In your normal day-to-day use, you probably only use a scheme and a host.
Example of a URL[edit]
The following figure displays two example URIs and their component parts. [3]
hierarchical part
┌───────────────────┴─────────────────────┐
authority path
┌───────────────┴───────────────┐┌───┴────┐
abc://username:password@example.com:123/path/data?key=value&key2=value2#fragid1
└┬┘ └───────┬───────┘ └────┬────┘ └┬┘ └─────────┬─────────┘ └──┬──┘
scheme user information host port query fragment
urn:example:mammal:monotreme:echidna
└┬┘ └──────────────┬───────────────┘
scheme path
Purpose of a URL[edit]
Do you understand this?[edit]
Standards[edit]
These standards are used from the IB Computer Science Subject Guide[4]
- Identify the characteristics of a uniform resource identifier (URI) URL.
- Describe the purpose of a URL.
References[edit]
- ↑ http://www.flaticon.com/
- ↑ https://en.wikipedia.org/wiki/URL
- ↑ https://en.wikipedia.org/wiki/Uniform_Resource_Identifier#Examples
- ↑ IB Diploma Programme Computer science guide (first examinations 2014). Cardiff, Wales, United Kingdom: International Baccalaureate Organization. January 2012.