Registry.terraform.io not responding

Unable to terraform init. Unable to view in browser.

From a previously-working TF dir:

terraform init

Initializing the backend...

Initializing provider plugins...
- Reusing previous version of hashicorp/aws from the dependency lock file
╷
│ Error: Failed to query available provider packages
│
│ Could not retrieve the list of available versions for provider hashicorp/aws: could not query provider registry for registry.terraform.io/hashicorp/aws:
│ 421 Misdirected Request
╵