Only apply CSP in production mode

config/initializers/content_security_policy.rb

@@ -2,6 +2,7 @@
 # For further information see the following documentation
 # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
 
+if Rails.env.production?
   assets_host = Rails.configuration.action_controller.asset_host || "https://#{ENV['WEB_DOMAIN'] || ENV['LOCAL_DOMAIN']}"
 
   Rails.application.config.content_security_policy do |p|
@@ -16,6 +17,7 @@ Rails.application.config.content_security_policy do |p|
     p.frame_src       :self, :https
     p.connect_src     :self, assets_host, Rails.configuration.x.streaming_api_base_url
   end
+end
 
 
 # Report CSP violations to a specified URI