How to get the Host or :authority header in Cro when using HTTP/2

When using Cro with HTTP1.1 I can access the requested Host via both the host method request.uri.host in Cro::Uri as well as the Host or :authority header sent by the browser via the request.header method in Cro::HTTP::Request.

However, when I use HTTP/2, none of these work. The Uri object only contains the schema and the path.

I'm using an official certificate with a wildcard for subdomains and running this locally by adding these subdomains to my hosts file. Chrome DevTools says it has sent the :authority request header under HTTP/2 and Firefox Developer Tools says it has sent the Host request header under HTTP/2. However if I write the headers to a log like below, I see several headers, but not the Host or :authority header.

sub routes() is export {
  route {
    get -> {
      my $log = "/data/myapp/logs/cro.log";
      my $fh = open $log, :w;
      my $host = request.uri.host;
      $fh.say( "Host with host method: " ~ $host );
      $host = request.header('Host');
      $fh.say( "Host: " ~ $host );
      $host = request.header(':authority');
      $fh.say(":authority: " ~ $host );
      $fh.say( "Request headers:" );
      for request.headers {
        $fh.say( "{.name}: {.value}" );
      }
      $fh.close;
      content 'text/html', "<h1> MyApp </h1><p>Running";
    }
  }
}

I'm aware that HTTP/2 uses Server Name Indication and that the host name is sent as part of the TLS negotiation. On the other hand this is also part of the Cro modules (Cro::TLS) and the headers are sent by the browser nonetheless.

So how to get the host under HTTP/2?

This appears to be a plain bug (unrelated to ones named by Raiph).

I wrote a patch and sent a PR (https://github.com/croservices/cro-http/pull/104), with it merged you can update your Cro::HTTP distribution and both ways you specified (request.uri construction or asking for header('Host')) will work.