New /adapt admin endpoint: Use your installed config adapters via
API in addition to the existing caddy adapt CLI command.

New Etag/If-Match support for config API: Safely update your config
concurrently and avoid collisions by using our unique Etag
implementation.

Rename copied headers from reverse_proxy: If you're using
handle_response, you can more easily map headers to a different name
for clients.

Many HTTP matchers have been added to CEL: You can now use the logic
of our HTTP request matchers in CEL expressions.