They did overlap in existence, but at least in my world, nsapi/fastcgi connections to a pooled app server wasn't as popular until later. I think because in the

They did overlap in existence, but at least in my world, nsapi/fastcgi connections to a pooled app server wasn't as popular until later. I think because in the beginning, both nsapi and fastcgi rolled out with commercial, non-free web servers. There wasn't a free fastcgi capability for Apache until 1999 or so, where mod_perl was around since 1996, I think.