breaks on some distro and needs further investigations; it's not that interesting fortunately.

undocumented flag to dump to stdout the request before doing it. Not useful, it's debugging leftover.

The code in fcgi_req to send the custom params set in the config file was placed inside the conditional for `tls_peer_cert_provided`, so the custom parameters would not be sent if a client certificate is not provided.

reported by Karl Jeacle, thanks!

It's not actually used and doesn't seem to be available on DragonflyBSD (at least) judging from the patching in dports: https://github.com/DragonFlyBSD/DPorts/commit/f66bf875f75335ff63e0cad2f817a1c6e7106045