*) Feature: the "max_headers" directive.
   Thanks to Maxim Dounin.

*) Feature: OpenSSL 4.0 compatibility.

*) Feature: now the "include" directive inside the "geo" block

   wildcards.

*) Bugfix: in processing of HTTP 103 (Early Hints) responses from a
   proxied backend.

*) Bugfix: the $request_port and $is_request_port variables were not
   available in subrequests.