Redirect wrong after form submit - ruby-on-rails

Question

I am started learning Ruby. I just followed this guide http://guides.rubyonrails.org/getting_started.html to create blog app. One thing I noticed if we try to submit the form without entering data from url http://localhost:3000/articles/new it showing error message and redirect to http://localhost:3000/articles
I think it should keep same url and show error message.
Not sure how to fix that.
articles_controller.rb
class ArticlesController < ApplicationController
def index
#articles = Article.all
end
def show
#article = Article.find(params[:id])
end
def new
#article = Article.new
end
def create
#article = Article.new(article_params)
if #article.save
redirect_to #article
else
render 'new'
end
end
private
def article_params
params.require(:article).permit(:title, :text)
end
end
new.html.erb
<%= form_with scope: :article, url: articles_path, local: true do |form| %>
<% if #article.errors.any? %>
<div id="error_explanation">
<h2>
<%= pluralize(#article.errors.count, "error") %> prohibited
this article from being saved:
</h2>
<ul>
<% #article.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<p>
<%= form.label :title %><br>
<%= form.text_field :title %>
</p>
<p>
<%= form.label :text %><br>
<%= form.text_area :text %>
</p>
<p>
<%= form.submit %>
</p>
<% end %>
<%= link_to 'Back', articles_path %>
routes.rb
Rails.application.routes.draw do
get 'welcome/index'
resources :articles
root 'welcome#index'
# For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end
rails routes
Prefix Verb URI Pattern Controller#Action
welcome_index GET /welcome/index(.:format) welcome#index
articles GET /articles(.:format) articles#index
POST /articles(.:format) articles#create
new_article GET /articles/new(.:format) articles#new
edit_article GET /articles/:id/edit(.:format) articles#edit
article GET /articles/:id(.:format) articles#show
PATCH /articles/:id(.:format) articles#update
PUT /articles/:id(.:format) articles#update
DELETE /articles/:id(.:format) articles#destroy
root GET / welcome#index

Answer 1

This is the standard behavior. If you want to change it however to keep the URL, you can modify the new and create actions:
def new
if article_params
create
return
end
#article = Article.new
render 'new'
end
def create
#article = Article.new(article_params)
if #article.save
redirect_to #article
else
render 'new'
end
end
And in routes.rb:
resources :articles
post "articles/new"

Answer 2

#Shannon answer is correct, I'm writing this for your comment on his answer, Try to use model argument, according to this when you gonna use model: #article it will generate everything automatically for you
Hope it helps.