Upgraded Rails to 6, getting Blocked host Error

Question

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\"
         


        

Answer 1

This article worked for me:

1. The first option is to whitelist the hostnames in config/environments/development.rb:

   Rails.application.configure do
     config.hosts << "hostname" # Whitelist one hostname
     config.hosts << /application\.local\Z/ # Whitelist a test domain
   end
   

2. The second option is to clear the entire whitelist, which lets through requests for all hostnames:

   Rails.application.configure do
     config.hosts.clear
   end
   

Credit goes to Manfred Stienstra.