It features highly configurable error messages, DBM-based authentication databases, and content negotiation but has been criticized for its lack of GUI tools to aid in its configuration. It has since evolved to rival (and probably surpass) almost any other Unix based HTTP server in terms of functionality and speed. Since April 1996 Apache has been the most popular HTTP server on the Internet; in May 1999 it was running on 57% of all web servers.
According to Netcraft, as of November 20, 2001, "The site www.wikipedia.com is running Apache/1.3.19 (Unix) PHP/4.0.4pl1 mod_fastcgi/2.2.10 on Linux."
Recently Apache received a substantial boost as Kylix and Delphi 6 development tools from Borland both support Apache (only Kylix can compile native Linux code).
/Talk?