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Investigation into Rails routing

I wanted to understand how combinations of resources :format and resources :constraints affected the HTTP response codes from Rails.

I created a new Rails 4.1.8 app and used scaffolding (rails g scaffold people name:string) to create a very simple app.

I started the Rails server and created a single person (with ID 1).

I updated the Routes and recorded the results of a request to GET the Person using cURL.

Resources

# In routes.rb
# resources :people

$ curl http://localhost:3000/people/1
#=> 200 html

$ curl http://localhost:3000/people/1a
#=> 200 html

$ curl http://localhost:3000/people/1.html
#=> 200 html

$ curl http://localhost:3000/people/1a.html
#=> 200 html

$ curl http://localhost:3000/people/1.png
#=> 500 Missing Template

$ curl http://localhost:3000/people/1a.png
#=> 500 Missing Template

Resources with format not allowed

# In routes.rb
# resources :people, format: false

$ curl http://localhost:3000/people/1
#=> 200 html

$ curl http://localhost:3000/people/1a
#=> 200 html

$ curl http://localhost:3000/people/1.html
#=> 404 Routing Error

$ curl http://localhost:3000/people/1a.html
#=> 404 Routing Error

$ curl http://localhost:3000/people/1.png
#=> 404 Routing Error

$ curl http://localhost:3000/people/1a.png
#=> 404 Routing Error

Resources with format required

# In routes.rb
# resources :people, format: true

$ curl http://localhost:3000/people/1
#=> 404 Routing error

$ curl http://localhost:3000/people/1a
#=> 404 Routing error

$ curl http://localhost:3000/people/1.html
#=> 200 html

$ curl http://localhost:3000/people/1a.html
#=> 200 html

$ curl http://localhost:3000/people/1.png
#=> 500 Missing Template

$ curl http://localhost:3000/people/1a.png
#=> 500 Missing Template

Resources with format set to html

# In routes.rb
# resources :people, format: :html

$ curl http://localhost:3000/people/1
#=> 200 html

$ curl http://localhost:3000/people/1a
#=> 200 html

$ curl http://localhost:3000/people/1.html
#=> 200 html

$ curl http://localhost:3000/people/1a.html
#=> 200 html

$ curl http://localhost:3000/people/1.png
#=> 500 Missing Template

$ curl http://localhost:3000/people/1a.png
#=> 500 Missing Template

Resources with constraint forcing numeric IDs

# In routes.rb
# resources :people, constraints: {id: /\d+/}

$ curl http://localhost:3000/people/1
#=> 200 html

$ curl http://localhost:3000/people/1a
#=> 404 Routing Error

$ curl http://localhost:3000/people/1.html
#=> 200 html

$ curl http://localhost:3000/people/1a.html
#=> 404 Routing Error

$ curl http://localhost:3000/people/1.png
#=> 500 Missing Template

$ curl http://localhost:3000/people/1a.png
#=> 404 Routing Error

Resources with constraint forcing numeric IDs and no Format

# In routes.rb
# resources :people, constraints: {id: /\d+/, format: //}

$ curl http://localhost:3000/people/1
#=> 200 html

$ curl http://localhost:3000/people/1a
#=> 404 Routing Error

$ curl http://localhost:3000/people/1.html
#=> 404 Routing Error

$ curl http://localhost:3000/people/1a.html
#=> 404 Routing Error

$ curl http://localhost:3000/people/1.png
#=> 404 Routing Error

$ curl http://localhost:3000/people/1a.png
#=> 404 Routing Error

Resources with constraint forcing numeric IDs and either html or no Format

# In routes.rb
# resources :people, constraints: {id: /\d+/, format: /html/}

$ curl http://localhost:3000/people/1
#=> 200 html

$ curl http://localhost:3000/people/1a
#=> 404 Routing Error

$ curl http://localhost:3000/people/1.html
#=> 200 html

$ curl http://localhost:3000/people/1a.html
#=> 404 Routing Error

$ curl http://localhost:3000/people/1.png
#=> 404 Routing Error

$ curl http://localhost:3000/people/1a.png
#=> 404 Routing Error
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