CORS issue: Getting error “No 'Access-Control-Allow-Origin' header is present” when it actually is

Question

I doubt the backend serving my app is important, but if you care, I\'m using rack-cors with a Rails 4.0 app.

Using jQuery, I send my app a PATCH request lik

Answer 1

You might want to add this to your config/application.rb file:

#config/application.rb
config.middleware.use Rack::Cors do
  allow do
    origins '*'
    resource '/*', :headers => :any, :methods => :patch
  end
end

The resource part is where you define which methods / requests your endpoint can accept!

Hope this helps