apache2-doc 2.4.18-2ubuntu3.9 (amd64 binary) in ubuntu xenial

 The Apache HTTP Server Project's goal is to build a secure, efficient and
 extensible HTTP server as standards-compliant open source software. The
 result has long been the number one web server on the Internet.
 .
 This package provides the documentation for the Apache 2 HTTP server. The
 documentation is shipped in HTML format and can be accessed from a local
 running Apache HTTP server instance or by browsing the file system directly.