No route [GET] / user matches

Edit: The resource and controller have been pluralized thanks to the feedback written in the comments. But my problem still persists.

I am very new to Rails and I am trying to create a REST API in Rails 4. I have a routing error when I try to make a GET request to a User

ressource:http://api.localhost:3000/users

No route match [GET] "/ users"

But when I execute the "rake routes" command in my terminal, I see that there is a route /users

:

    api_users GET    /users(.:format)          api/users#index {:subdomain=>"api"}
              POST   /users(.:format)          api/users#create {:subdomain=>"api"}  
 new_api_user GET    /users/new(.:format)      api/users#new {:subdomain=>"api"}
edit_api_user GET    /users/:id/edit(.:format) api/users#edit {:subdomain=>"api"}
     api_user GET    /users/:id(.:format)      api/users#show {:subdomain=>"api"}
              PATCH  /users/:id(.:format)      api/users#update {:subdomain=>"api"}
              PUT    /users/:id(.:format)      api/users#update {:subdomain=>"api"}
              DELETE /users/:id(.:format)      api/users#destroy {:subdomain=>"api"}

      

        
        
        
      

    

Here is the content of my file route.rb

:

Rails.application.routes.draw do

  # create rousources in subdomain api
  namespace :api, path: '/', constraints: { subdomain: 'api' } do
    resources :users
  end

end

      

        
        
        
      

    

And the file users_controller.rb

:

module Api
    class UsersController < ApplicationController

        def index
            @users = User.all

            render json: users, status: 200
        end

    end
end

      

        
        
        
      

    

Any suggestion?

Edit: The resource and controller have been pluralized thanks to the feedback written in the comments. But my problem still persists.