Configuring CORS headers

Depending on how you've setup your app, you may encounter a CORS error. It will look like this in your browser console:
In this case, you need to configure the right CORS headers to allow the domain app.forestadmin.com to trigger an API call on your Application URL, which is a different domain name (e.g. localhost:3000 on development).
Rails
Rails
We use the Rack CORS Gem for this purpose.
gemfile
# Gemfile
source 'https://rubygems.org'
​
# ...
​
gem 'forest_liana'
gem 'rack-cors'
congif/application.rb
module YourApp
  class Application < Rails::Application
    # ...
​
    # For Rails 5, use the class Rack::Cors. For Rails 4, you MUST use the string 'Rack::Cors'.
    config.middleware.insert_before 0, Rack::Cors do
      allow do
        origins 'app.forestadmin.com'
        resource '*', headers: :any, methods: :any,
        expose: ['Content-Disposition'],
        credentials: true
      end
    end
  end
end

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Last updated 1 month ago