Core: only resolve address families configured on the local system. This is done by passing AI_ADDRCONFIG to getaddrinfo(). On Linux, setting net.ipv6.conf.all.disable_ipv6 to 1 will now be respected. On FreeBSD, AI_ADDRCONFIG filtering is currently implemented by attempting to create a datagram socket for the corresponding family, which succeeds even if the system doesn't in fact have any addresses of that family configured. That is, if the system with IPv6 support in the kernel doesn't have IPv6 addresses configured, AI_ADDRCONFIG will filter out IPv6 only inside a jail without IPv6 addresses or with IPv6 disabled.

scgi_param  REQUEST_METHOD     $request_method;
scgi_param  REQUEST_URI        $request_uri;
scgi_param  QUERY_STRING       $query_string;
scgi_param  CONTENT_TYPE       $content_type;

scgi_param  DOCUMENT_URI       $document_uri;
scgi_param  DOCUMENT_ROOT      $document_root;
scgi_param  SCGI               1;
scgi_param  SERVER_PROTOCOL    $server_protocol;
scgi_param  HTTPS              $https if_not_empty;

scgi_param  REMOTE_ADDR        $remote_addr;
scgi_param  REMOTE_PORT        $remote_port;
scgi_param  SERVER_PORT        $server_port;
scgi_param  SERVER_NAME        $server_name;