Capybara website allows you to set unknown urls

I am using capybara webkit for some of my rspec tests in a rails app. I want allow_unknown_urls and set this in the spec_helper.rb file according to the guide for global config here https://github.com/thoughtbot/capybara-webkit/ - this is my current spec_helper.rb file:

# This file was generated by the `rails generate rspec:install` command. Conventionally, all
# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
# The generated `.rspec` file contains `--require spec_helper` which will cause
# this file to always be loaded, without a need to explicitly require it in any
# files.
#
# Given that it is always loaded, you are encouraged to keep this file as
# light-weight as possible. Requiring heavyweight dependencies from this file
# will add to the boot time of your test suite on EVERY test run, even for an
# individual file that may not need all of that loaded. Instead, consider making
# a separate helper file that requires the additional dependencies and performs
# the additional setup, and require it from the spec files that actually need
# it.
#
# The `.rspec` file also contains a few flags that are not defaults but that
# users commonly want.
#
# See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
ENV["RAILS_ENV"] ||= "test"
ENV['SERVER_NAME'] = "user.myapp.com"

require File.expand_path("../../config/environment", __FILE__)
require "rspec/rails"


Capybara::Webkit.configure do |config|
  # Enable debug mode. Prints a log of everything the driver is doing.
  config.debug = false

  config.allow_unknown_urls
  # Allow pages to make requests to any URL without issuing a warning.

  # Allow a specifc domain without issuing a warning.
  config.allow_url("checkout.stripe.com")



  # Timeout if requests take longer than 5 seconds
  config.timeout = 10

  # Don't raise errors when SSL certificates can't be validated
  config.ignore_ssl_errors

end

Capybara.javascript_driver = :webkit

Dir[Rails.root.join("spec/support/**/*.rb")].each {|f| require f}

RSpec.configure do |config|
  # rspec-expectations config goes here. You can use an alternate
  # assertion/expectation library such as wrong or the stdlib/minitest
  # assertions if you prefer.
  config.use_transactional_fixtures = false
  config.before(:suite) do
    DatabaseCleaner.clean_with(:truncation)
  end

  config.before(:each) do |example|
    DatabaseCleaner.strategy= example.metadata[:js] ? :truncation : :transaction
    DatabaseCleaner.start
  end

  config.after(:each) do
    DatabaseCleaner.clean
  end

  config.include SignInHelpers, type: :feature
  config.mock_with :rspec

  config.expect_with :rspec do |expectations|
    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
  end

  # rspec-mocks config goes here. You can use an alternate test double
  # library (such as bogus or mocha) by changing the `mock_with` option here.
  config.mock_with :rspec do |mocks|
    # Prevents you from mocking or stubbing a method that does not exist on
    # a real object. This is generally recommended, and will default to
    # `true` in RSpec 4.
    mocks.verify_partial_doubles = true
  end
end

      

        
        
        
      

    

As you can see in the configure webkit block I am setting config.allow_unknown_urls and also explicitly allowing checkout.stripe.com

When I run my test which uses webkit I get the following warnings:

WARNING: The next major version of capybara-webkit will require at least version 5.0 of Qt. You're using version 4.8.7.
Request to unknown URL: https://checkout.stripe.com/v3/data/languages/en.json
To block requests to unknown URLs:
  page.driver.block_unknown_urls
To allow just this URL:
  page.driver.allow_url("https://checkout.stripe.com/v3/data/languages/en.json")
To allow requests to URLs from this host:
  page.driver.allow_url("checkout.stripe.com")
  Buyer creates a new event

      

        
        
        
      

    

This confuses me as my web kit is configured to resolve all unknown urls and explicitly checkout.stripe.com. What have I configured incorrectly here?