Package httpd is a virtual package provided by:
  yaws 1.98-5
  webfs 1.21+ds1-10
  tntnet 2.2.1-1
  ocsigenserver 2.4.0-1build1
  nginx-light 1.9.3-1ubuntu1
  nginx-full 1.9.3-1ubuntu1
  nginx-extras 1.9.3-1ubuntu1
  mini-httpd 1.19-9.3
  micro-httpd 20051212-15
  lighttpd 1.4.35-4ubuntu1
  ebhttpd 1:1.0.dfsg.1-4.3
  aolserver4-daemon 4.5.1-18
  aolserver4-core 4.5.1-18
  nginx-core 1.9.3-1ubuntu1
  apache2-mpm-worker 2.4.10-9ubuntu1
  apache2-mpm-prefork 2.4.10-9ubuntu1
  apache2 2.4.12-2ubuntu1