/** Make a play. Only allows the joined players to  */
app.get('/:gameid/set/:column', (req, res) => {
    const userid = getUserId(req, res);
    const game = games[parseInt(req.params['gameid'])]
    if (game == undefined) {
        res.status(404).json("no such game");
    } else if (game.state != "playing") {
        res.status(403).json("game is not playing");
    } else if (getCurrentPlayer(game) == userid) {
        let column = parseInt(req.params['column']);
        dropPiece(game, column);
        res.json(toJson(game, userid));
    } else {
        res.status(403);
        res.json("Not your turn, my friend");
    }
})