I don't know what the landscape was like in 2004 really, but probably at least an order of magnitude less than today's bazillion (whatever that would be!).
Nginx was first released to the public in 2004 [1]. Apache was released in 1995 [2].
On a more personal note, wow! I had no idea I started using the Internet for realz before the release of Apache, in 1994. This young made me feel, not.