Asset canister giving 404 for HTTP requests even if file exists

[Severin]

[FOLLOW UP ON ITEM] New canisters will only be accessible through the icp0.io domain. Existing canisters will be accessible both through ic0.app and icp0.io

Update: TLDR: As of March 20, 2023 April 20, 2023, new canisters will only be accessible through the icp0.io domain. Existing canisters will be accessible both through ic0.app and icp0.io. 1. Summary In February 2023, Spamhaus temporarily added ic0.app to a blocklist. As a result, an extensive mitigation plan was put in place and communicated to the IC community. While the need for a new default domain is less pressing now that ic0.app is no longer on a blocklist, good reasons remain to intro…