The list of all webservers used to fit on a single page, which might be a good starting point. However, at this point I believe anything still functioning might fit your definition of a "mirror" as few things still speak HTTP/0.9.
http://info.in2p3.fr./cc.gif
dated 30 Sept 1992, which is pretty old as far as the web goes.
The list of all webservers used to fit on a single page, which might be a good starting point. However, at this point I believe anything still functioning might fit your definition of a "mirror" as few things still speak HTTP/0.9.