module Rack
# Returns a user-friendly exception page.
# Should be included at the very top of the middleware pipeline so that unhandled
# exceptions from anywhere down the pipeline are rescued.
# In development, you'd want to use the developer-friendly Rack::ShowExceptions instead.
#
# config.ru example:
#
# if ENV['RACK_ENV'] == 'development'
# use Rack::ShowExceptions
# else
# use Rack::PublicExceptionPage
# end
#
# The default HTML included here is a copy of the 500 page included with Rails
# You can optionally specify your own file, ex:
#
# use Rack::PublicExceptionPage, "public/500.html"
class PublicExceptionPage
def initialize(app, file_path = nil)
@app = app
@file_path = file_path
end
def call(env)
@app.call(env)
rescue ::Exception
[500, {'Content-Type' => 'text/html', 'Content-Length' => html.length.to_s}, [html]]
end
private
def html
@html ||= @file_path ? ::File.read(@file_path) : default_html
end
# Exception page from Rails (500.html)
def default_html
<<-EOV
We're sorry, but something went wrong (500)
We're sorry, but something went wrong.
We've been notified about this issue and we'll take a look at it shortly.