Uniform resource identifier (URI) and URL: Difference between revisions
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== Characteristics of a URI == | == Characteristics of a URI == | ||
Revision as of 13:02, 26 March 2017
Characteristics of a URI[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.
Please click here to see a list of all the available schemes. There's a LOT more than HTTP and HTTPS!!
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]
A URL is a string of characters used to identify a resource. The purpose of a URL is to easily retrieve network resources. URL's also make linking to resources easier.
Do you understand this?[edit]
- identify each part of this URI:
file:///Users/billdagjana/Desktop/
- Which one of these does a URI NOT do:
- Enable easier access to resources
- Provide excellent resources for linking between resources
- Allow you to more quickly download content
- Provide a unified syntax to access remote resources
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.