Difference Between URL, URI and URN in Java
Last Updated :
15 Jul, 2024
URI stands for Uniform Resource Identifier. URI is a sequence of characters used to identify a resource location or a name or both over the World Wide Web. A URI can be further classified as a locator, a name, or both.
Syntax of URI: Starts with a scheme followed by a colon character, and then by a scheme-specific part.
The most popular URI schemes, are HTTP, HTTPS, and FTP.
URL stands for Uniform Resource Location. URL is a subset of URI that describes the network address or location where the source is available.URL begins with the name of the protocol to be used for accessing the resource and then a specific resource location. URLs build on the Domain Name Service (DNS) to address hosts symbolically and use a file-path-like syntax to identify specific resources at a given host. For this reason, mapping URLs to physical resources is straightforward and is implemented by various Web browsers.
URN stands for Uniform Resource Name. It is a URI that uses a URN scheme.
"urn" scheme: It is followed by a namespace identifier, followed by a colon, followed by namespace specific string
URN does not imply the availability of the identified resource. URNs are location-independent resource identifiers and are designed to make it easy to map other namespaces into URN space.
| URI | URL | URN |
|---|
| URI stands for Uniform Resource Identifier. | URL stands for Uniform Resource Location. | URN stands for Uniform Resource Name. |
| URI is a superset of URL & URN | URL is a subset of URI. | URN is a subset of URI. |
| It is used to identify a resource on the internet either by location or name or both. | It is used to identify a resource on the internet either by location. | It uniquely identifies the resource by name. |
| URI is not always a URL | All URLs are URIs | All URNs are URIs |
| URI includes components like scheme, authority, path, query, etc. | URL includes protocol, domain, path, hash, query, string etc. | URN does not include any component. |
Examples: - https://www.example.com/page.html
- urn:isbn:0451450523
| Examples: - https://www.geeksforgeeks.org/
- https://www.example.com/page.html
| Examples: - urn:isbn:0451450523
- urn:ietf:rfc:3986
|
Here is a diagram that shows the relationship between URL, URI, URN:
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