How to design URL?

• URLs should include nouns, not verbs.
• User plural nouns only for consistency (no singular nouns).
• Use HTTP methods (HTTP/1.1) to operate on these resources:
• Use HTTP response status codes to represent the outcome of operations on resources.

URI normalization

To transform a URI into a normalized URI have a Goal:

The normalization is possible to determine if two syntactically different URIs may be equivalent.

1. Converting percent-encoded triplets to uppercase.
   
   http://example.com/foo%2a → http://example.com/foo%2A

2. Converting the scheme and host to lowercase.
   
   HTTP://User@Example.COM/Foo → http://User@example.com/Foo

3. Decoding percent-encoded triplets of unreserved characters. Percent-encoded triplets of the URI in the range of ALPHA, DIGIT, hyphen, period, underscore, or tilde ... should be decoded ...
   
   http://example.com/%7Efoo → http://example.com/~foo

4. Removing dot-segment.
   
   http://example.com/foo/./bar/baz/../qux → http://example.com/foo/bar/qux

5. Converting an empty path to a "/" path.
   
   http://example.com → http://example.com/

6. Removing the default port.
   
   http://example.com:80/ → http://example.com/

Reference [HTTP: The Definitive Guide]