Connection-route of node.js taking wrong parameters informations

I've a problem with my node.js application. I'm using the packages connection, connection-route, socket.io and ejs.

My application provides informations to the html page (connected via socket.io), these informations are managed by an ejs template. When I reach a destination with a parameter, like http://localhost:5001/machine/:id2, something strange happens. The connection route code is the following:

router.get('/machine/:mac_id', function (req, res, next) {
    var mac_index = req.params.mac_id.slice(1,req.params.mac_id.length);
    console.log(mac_index);
    res.writeHead(200, { 'Content-Type': 'text/html' });
    var str = mod_fs.readFileSync(mac_route + '/index.html', 'utf8') ;
    var ret = mod_ejs.render(str, { 
        filename: mac_route,
        title: "Machine Overview",
        /* other informations */
    });
    res.end(ret);
}

The variable mac_route contains the path to the file index.html, which is loaded correctly. The problem lies in the mac_index variable. On the console are printed 3 rows:

id2
unctions.js
query-1.9.1.js

The first row is obviously correct, the last 2 rows are obviously not correct, infact these are two javascript files (my file functions.js and the file for jquery jquery-1.9.1.js). These files are included in the header of the index.html file.

HTML STRUCTURE:

header.html

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title> <%= title %> </title>
        <link rel='stylesheet' href='/style.css' type="text/css"/>
        <script src="http://localhost:5001/socket.io/socket.io.js"></script>
        <script language="javascript" type="text/javascript" src="functions.js"></script>
        <script language="javascript" type="text/javascript" src="jquery-1.9.1.js"></script>
    </head>
    <body>  
        <div id="header">
            ...
        </div>
        <div id="page">

index.html

<% include /header.html %>
<div id="commands">
    ...
</div>
<div id="main">
    ... code of the page, manage informations received ...
</div>
<% include /footer.html %>

footer.html

        <div id="footer">
            ...
        </div>
    </div> <!-- Close the "page" div opened in the header //-->
</body>
</html>

I can't find where's the mistake. Why the file's names are taken as parameter of the req object?

The normalized URL for those files is:

http://localhost:5001/machine/functions.js
http://localhost:5001/machine/jquery-1.9.1.js

Those match your route (/machine/:mac_id), so they will be handled by it.

Try including the connect.static middleware before your routes: 

app.use(connect.static(__dirname));

(this assumes your Connect app is stored in the app variable and the JS files are in the same directory as your Node script; if not, change __dirname to point to the directory where the JS files are located).