Express middleware to inject content into <head>

I'd like to create some Express middleware that injects content into the <head> part of every HTML document returned by the server. Is this possible or advisable?

Thanks!

Express Documentation/res.set

Example:

app.all("*", function(req,res,next){
    res.set({
        "Myheader1":"Data1",
        "MyHeader2":"Data2"
    });
    next();
});

You should be using a templating engine like JADE, it allows layouts, you can define basic inheritance. I advise you to look at Template inheritance from Jade documentation. I bet most templating languages have this functionality.