Use of HTTP placeholder inside php_server block

[AirBair]

Hi,

Motivated by the API-Platform Conference, I'm trying to configure FrankenPHP behind an apache reverse proxy which has Kerberos authentication. To do so, I forward the authenticated user with the following directive: RequestHeader set X-Proxy-Remote-User %{REMOTE_USER}

In NGINX in place of FrankenPHP, this works with the following configuration:

fastcgi_param REMOTE_USER $http_x_proxy_remote_user;

To replicate this in FrankenPHP/Caddy, I modified the Caddyfile like this:

{$SERVER_NAME:localhost} {
        # ...
        php_server {
            env REMOTE_USER {http.request.header.X-Proxy-Remote-User}
        }
}

But the variable is not being populated with the actual value of the header:

If I move the variable assignment outside of the php_server block, the actual value is passed correct, but i also got an HTTP_ prefix as expected

{$SERVER_NAME:localhost} {
        # ...
        php_server
        request_header +REMOTE_USER {http.request.header.X-Proxy-Remote-User}
}

It seems that placeholders (e.g., {http.request.header.X-Proxy-Remote-User}) don't work inside the php_server block, but I couldn't find any documentation stating whether this is intended behavior or if it's a misconfiguration on my part.

I can work around by using the HTTP_REMOTE_USER header, but I’d appreciate any insights to confirm or help me understand.

Thanks for your feedback.

[AirBair]

Fixed since v1.3.0