/usr/lib/ghc-doc/hoogle/HTTP.txt is in libghc-http-doc 1:4000.2.8-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-http-doc/html/HTTP.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-http-doc/html/HTTP.txt