Nuts and Bolts: URL's
INFO 253A: Front end Web Architecture
Kay Ashaolu
URI
- Uniform Resource Identifier
- http://www.yelp.com/biz/jupiter-berkeley#query:jupiters
URI - URL - URN
-
URI (Identifier)
- Identifies some resource (e.g. person or file)
-
URL (Location)
- Specifies the Location of an identifier
- Implies availability
-
URN (Name)
- Specifies the Name of an identifier
- Does not imply availability
Example
-
Full URI
- http://www.yelp.com/biz/jupiter-berkeley#query:jupiters
-
URL Portion
- http://www.yelp.com/biz/jupiter-berkeley
-
URN Portion
- www.yelp.com/biz/jupiter-berkeley#query:jupiters
Resource
- Any concept you can name or identify
- So far, typically files
- Also generated pages, like a user profile
Components
- http://www.yelp.com/biz/jupiter-berkeley#query:jupiters
Scheme
- http://www.yelp.com/biz/jupiter-berkeley#query:jupiters
- Specifies how the rest of the URI is laid out
- Typically protocols
Hierarchical
- http://www.yelp.com/biz/jupiter-berkeley#query:jupiters
- "Directions" to the resource through hosts and folders
Domain / Hostname
- http://www.yelp.com/biz/jupiter-berkeley#query:jupiters
- "Site" or machine name
Path
- http://www.yelp.com/biz/jupiter-berkeley#query:jupiters
- Similar to directories, but not necessarily linked!
- Groups common resources together
Path
-
Relative
- biz/jupiter-berkeley#query:jupiters
-
Absolute
- http://www.yelp.com/biz/jupiter-berkeley#query:jupiters
Query (Optional)
- https://www.google.com/?q=ischool&ref=class
- Starts with ?
- key=value pairs, delimited by &
- NOTE: This is one way of sending parameters to a server
Port Number
- https://www.ischool.berkeley.edu:443/index.php
- Specifies a port number to connect to
- Ports are like doorways to a server
- Common ports: 80 for HTTP, 443 for HTTPS
Fragment
- http://en.wikipedia.org/wiki/URI_scheme#Examples
- Specify a sub-resource, eg. a section on a page
- Browser will jump to element id
Questions
URL's - Frontend Webarch
By kayashaolu