function loginTry(req , res)
{

	var pseudoAlreadyUsed = function(pseudo)
	{

		var list = getListSessionPseudo();
		console.log("list " + list);
		list.forEach(function(i){
			console.log(pseudo + "  " + i);
			if (pseudo == i)
			{
				console.log("true");
				return true;

			}
		});
			return false;

	}

	if(req.body.pseudo)
	{
		var test = pseudoAlreadyUsed(req.body.pseudo);
		console.log("test du if " + test);
		if(test )
		{
			console.log("true2");
			res.send("Pseudo already used");
		}
		else
		{

			req.session.pseudo = req.body.pseudo;
			req.session.save();
			listOfSessions.push(req.session);
			return res.redirect("/");
		}
	}
	else
	{
		var htmlDirectory = __dirname + '/public/login.html';
		res.sendFile(htmlDirectory);
	}
}