Upgraded Rails to 6, getting Blocked host Error

ruby-on-rails cloud9 ruby-on-rails-6
Tony S. picture Tony S. · Dec 21, 2018 · Viewed 23k times · Source

I needed the new function in ActiveStorage to resize_to_fill so I upgraded to Ruby 2.5.1 and Rails 6.

ruby '2.5.1'

gem "rails", github: "rails/rails"

When I stopped, then started my server (Cloud 9), I received the Rails error:

Blocked host: xxxxxxx-xxxxxxx.c9users.io To allow requests to xxxxxxx-xxxxxxx.c9users.io, add the following configuration:

Rails.application.config.hosts << "xxxxxxx-xxxxxxx.c9users.io"

I've tried restarting, new windows, but nothing gets rid of this. I've never seen this error before. I'm guessing the new version of Rails is doing something?

Answer

Dat Le Tien picture Dat Le Tien · Jul 17, 2019

The Blocked Host is a new feature of Rails 6. You can add this pattern to your config/environments/development.rb to have no worries of that in case of dynamic urls

config.hosts << /[a-z0-9]+\.c9users\.io/

Also for ngrok user, just replace above c9users by ngrok

Source: https://github.com/MikeRogers0/puma-ngrok-tunnel

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