I'd like to include a health check into the docker file. E.g.

HEALTHCHECK --interval=5s --timeout=3s \
  CMD curl --fail http://localhost:$PORT/_health || exit 1

So it would be nice to have a /_health route or something similar. The controller function should check if the connection to the mysql database is still alive. Or maybe a _version route, where xmysql responses with the connected mysql version. This can also be used for a health check.

What do you think?