Http::Cat::Rails

http-cat-rails is a configurable gem that changes every http-error page in your rails application with an image of a cute little cat, that describes purrfectly the error code (credits for the default images to https://http.cat)

This gem is highly customizable: you could even decide to self host your own error images, and use them.
To change this gem's behaviour, you can create a http_cat_rails.rb inside /config/initializers, and structure it as follows:

Http::Cat::Rails.configure do |c|
  c.base_url = "https://www.myurl.com/"
  c.status_codes = { "404": "code_name", "500": "code_name_2" }
  c.layout = "application"
  c.extension = :jpg
end

In this example, if an error 404 is raised, your page will load an image inside your application.html.erb from the following url: "https://www.myurl.com/404.jpg"

This option is used to set the base url to retrieve images

This option is used to pass an Hash of status codes, to limit them, or change the url visited. The value of each element must be unique, since it's used to define a function.

• "application" to embed http error page inside your application.html.erb
• false to don't have a layout
• "layout_default" (default option: just a black background)
• "custom_error_layout" to embed http error page inside "/views/layouts/custom_error_layout.html.erb"

Extension to insert in the url. Can also be false or nil, to dont include an extension

The img tag that contains the image has the following class: "http_error_image"
You can customize its style using that

url_to_visit:

"#{base_url}#{code_of_this_error}#{".#{extension}" if extension}"

Add this line to your application's Gemfile:

gem "http-cat-rails"

And then execute:

$ bundle

Or install it yourself as:

$ gem install http-cat-rails

Then, you'll need to add this line to your application.rb:

config.exceptions_app = self.routes

This gem won't work if your application.rb or <your_environment>.rb contains the following line

config.consider_all_requests_local = true

It's a small project, but if you want to contribute feel free to send a Pull Request, or open an Issue

The gem is available as open source under the terms of the MIT License.