Welcome to the Merecat web server. This is the default landing page for new installations. Seeing this means the web server is working and the owner has not set up any pages of their own yet.
It expands on the features originally offered by thttpd, e.g. native HTTPS support, PHP CGI, gzip deflate using zlib, dual server support; both HTTP & HTTPS from one process, and built-in HTTP redirect. The resulting footprint (~140 kiB) makes it suitable for small and embedded systems. See these fine manual pages for more information: