Should you use plural or singular form of folder name in URL

Question

Example 1:

http://www.example.com/image/logo.png
http://www.example.com/images/logo.png

Example 2:

http://www.example.com/user/johndoe
http://www.example.com/users/johndoe

Especially if you use the Url as REST API. (Example 2)

Which one is recommended and why?

Answer 1

For REST, i mainly use the plural form to indicate a path to the resource. But you also have to take the Cacheablility, Frequency of Change and the Mutability of the Resource. In my case, collections of the resource is mainly the case, so i had used the plural form.

The reason for this is that for example:

http://www.example.com/users/johndoe

will serve the URI to GET the user johndoe which belongs to your collection of users.

http://www.example.com/users

will be used as the URI to GET all users and can be easily be used on query url like:

http://www.example.com/users?limit=5

creating a new user will still use the same URL then using POST & passing the parameters:

http://www.example.com/users

for refs you may want to check the Oreilly book RESTful Web Services Cookbook