CloudFront Rails Block Hosts
HostAuthorization Error
If you’re getting this Rails error when you’re using CloudFront.
START RequestId: b6614a37-2f42-4cde-87a3-c913a91583a4 Version: $LATEST
E, [2024-04-14T03:20:33.825228 #8] ERROR -- : [ActionDispatch::HostAuthorization::DefaultResponseApp] Blocked hosts: www.example.com
END RequestId: b6614a37-2f42-4cde-87a3-c913a91583a4
REPORT RequestId: b6614a37-2f42-4cde-87a3-c913a91583a4 Duration: 3.45 ms Billed Duration: 4 ms Memory Size: 1536 MB Max Memory Used: 347 MB
Rails 7.1+ only does a HostAuthorization check when config.hosts has been configured. This means that you have configured config.hosts but not allowed www.example.com.
Solution
module Demo
class Application < Rails::Application
config.hosts += [/.*\.amazonaws\.com/, /.*\.on\.aws/, "www.example.com"]
# Initialize configuration defaults for originally generated Rails version.
config.load_defaults 7.1