This middleware rescues any exception returned by the application and renders nice exception pages if it’s being rescued locally.

Methods
C
N
Constants
RESCUES_TEMPLATE_PATH = File.join(File.dirname(__FILE__), 'templates')
FAILSAFE_RESPONSE = [500, {'Content-Type' => 'text/html'}, ["<html><body><h1>500 Internal Server Error</h1>" << "If you are the administrator of this website, then please read this web " << "application's log file and/or the web server's log file to find out what " << "went wrong.</body></html>"]]
Class Public methods
new(app, consider_all_requests_local = false)

Source: show | on GitHub 

# File actionpack/lib/action_dispatch/middleware/show_exceptions.rb, line 40
def initialize(app, consider_all_requests_local = false)
  @app = app
  @consider_all_requests_local = consider_all_requests_local
end
Instance Public methods
call(env)

Source: show | on GitHub 

# File actionpack/lib/action_dispatch/middleware/show_exceptions.rb, line 45
def call(env)
  begin
    status, headers, body = @app.call(env)
    exception = nil

    # Only this middleware cares about RoutingError. So, let's just raise
    # it here.
    if headers['X-Cascade'] == 'pass'
       raise ActionController::RoutingError, "No route matches [#{env['REQUEST_METHOD']}] #{env['PATH_INFO'].inspect}"
    end
  rescue Exception => exception
    raise exception if env['action_dispatch.show_exceptions'] == false
  end

  exception ? render_exception(env, exception) : [status, headers, body]
end