Render exceptions via ErrorsController

show_exceptions.rb

require 'action_dispatch/middleware/show_exceptions'
 
module ActionDispatch
  class ShowExceptions
  private
    def render_exception_with_template(env, exception)
      body = ErrorsController.action(ActionDispatch::ExceptionWrapper.rescue_responses[exception.class.name]).call(env)
      body[1]['Content-Type'] = "application/json; charset=utf-8"
      body
    rescue => e
      render_exception_without_template(env, exception)
    end

    alias_method_chain :render_exception, :template
  end
end