Check if downloading a file larger then a limit.

check.js

var maxSize = 10485760;

request({
    url: url,
    method: "HEAD"
}, function(err, headRes) {
    var size = headRes.headers['content-length'];
    if (size > maxSize) {
        console.log('Resource size exceeds limit (' + size + ')');
    } else {
        var file = fs.createWriteStream(filename),
            size = 0;

        var res = request({ url: url });

        res.on('data', function(data) {
            size += data.length;

            if (size > maxSize) {
                console.log('Resource stream exceeded limit (' + size + ')');

                res.abort(); // Abort the response (close and cleanup the stream)
                fs.unlink(filename); // Delete the file we were downloading the data to
            }
        }).pipe(file);
    }
});