URL components and their names

This post explains the names of different parts of a URL. For a given URL like

https://blog.mysite.com:8080/marketing/parts-url;foo=bar?key1=hello&key2=world#qux

Names for individual components:

• https: Scheme
• blog: Subdomain
• mysite: 2nd-level domain
• com: Top-level domain
• blog.mysite.com: Host
• 8080: Port
• /marketing/parts-url: Path
• foo=bar: Params.
• key1=hello&key2=world: Query
• qux: Fragment.

Names for combination of multiple components:

• blog.mysite.com:8080: i.e. <host>:<port>, Network location/Socket
• https://blog.mysite.com:8080: i.e. <scheme>://<host>:<port>, Origin

Parsing example in Python:

>>> from urllib.parse import urlparse
>>> urlparse("https://blog.example.com:8080/marketing/parts-url;foo=bar?key1=hello&key2=world#qux")
ParseResult(scheme='https', netloc='blog.example.com:8080', path='/marketing/parts-url', params='foo=bar', query='key1=hello&key2=world', fragment='qux')

References:

• RFC 1808 Relative Uniform Resource Locators
  • Generic-RL syntax: <scheme>://<net_loc>/<path>;<params>?<query>#<fragment>