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Rack middleware for redirecting unsupported browser requests to "please upgrade" page
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Want friendly "please upgrade your browser" page? This gem is for you.

You can redirect your visitors to any page you like (static or dynamic). Just specify config.location option in initializer file.


Add following line to your Gemfile:

gem 'browsernizer'

Hook it up:

rails generate browsernizer:install

Configure browser support in config/initializers/browsernizer.rb file.


Initializer file is pretty self explanatory. Here is the default one:

Rails.application.config.middleware.use Browsernizer::Router do |config|
  config.supported "Internet Explorer", "9"
  config.supported "Firefox", "4"
  config.supported "Opera", "11.1"
  config.supported "Chrome", "7"

  config.location  "/browser.html"
  config.exclude   %r{^/assets}

It states that IE9+, FF4+, Opera 11.1+ and Chrome 7+ are supported. Non listed browsers are considered to be supported regardless of their version. Unsupported browsers will be redirected to /browser.html page.

By default, only requests with HTTP_ACCEPT header set to text/html are processed. Sometimes this header is not set by the browser. To overcome this issue, the exclude option is added to the config.

You can specify which paths you wish to exclude with exclude method. It accepts string or regular expression. You can specify multiple paths by calling the config.exclude multiple times.

If you wish to completely prevent some browsers from accessing website (regardless of their version), for now you can specify some really high version number (e.g. "666").

Specifying location is optional. If you prefer handling unsupported browsers on your own, you can access browsernizer info from request.env['browsernizer'] within your controller.

For example, you can set before filter to display flash notice:

before_filter :check_browser_support

def check_browser_support
  unless request.env['browsernizer']['supported']
    flash.notice = "Your browser is not supported"

You can also access browser and version variables from this env hash.


You should specify browser name as a string. Here are the available options:

  • Chrome
  • Firefox
  • Safari
  • Opera
  • Internet Explorer

And some less popular:

  • Android
  • webOS
  • BlackBerry
  • Symbian
  • Camino
  • Iceweasel
  • Seamonkey

Browser detection is done using useragent gem.

Credits and License

Developed by Milovan Zogovic.

I don't believe in licenses and other legal crap. Do whatever you want with this :)

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