adconrad@nosferatu:~$ grep-dctrl -sPackage -FProvides httpd /var/lib/apt/lists/*Packages | sort -u
Package: aolserver4-core
Package: aolserver4-daemon
Package: apache2
Package: apache2-mpm-prefork
Package: apache2-mpm-worker
Package: ebhttpd
Package: gunicorn
Package: libapache2-mod-wsgi
Package: libapache2-mod-wsgi-py3
Package: libnethttpd-ocaml-dev
Package: lighttpd
Package: micro-httpd
Package: mini-httpd
Package: nginx-core
Package: nginx-extras
Package: nginx-full
Package: nginx-light
Package: ocsigenserver
Package: tntnet
Package: uwsgi-plugin-python
Package: uwsgi-plugin-python3
Package: webfs
Package: yaws