Man pages matching name net::fastcgi::protocol in section 3pm:

Net::FastCGI::Protocol.3pm.en	debian 10 / libnet-fastcgi-perl
Net::FastCGI::Protocol.3pm.en	debian 11 / libnet-fastcgi-perl
Net::FastCGI::Protocol.3pm.en	debian 12 / libnet-fastcgi-perl