This project is moving into the depot. Upstream is
github/thkoch2001/planet-mars.
This commit does not yet add a Nix build, only imports the code and matches
formatting requirements.
The import has been josh-filtered, which will allow us to continue publishing
the history to the previous repo.
Change-Id: I9cb184b5af3f74a0b4079bac499b4db039b7939b
Nginx's std cfg only returns 304 with If-Unmodified-Since header, if the date
is exactly the one it expects, not the date the client did its last request.
This makes sense as it is much easier to compare two strings for equality than
to parse the date received from the client and check the ordering with the
server known last_modified value.
