Advanced REST client (chrome extension) - GET request with params

I'm trying to simulate GET request with params in the header:
I'm using NodeJS, here is my function: 

 module.exports.validate = function (req, res, db, callback) {
// if the request dosent have a header with email, reject the request
    if (!req.params.token) {
        res.writeHead(403, {
            'Content-Type': 'application/json; charset=utf-8'
        });
        res.end(JSON.stringify({
            error: "You are not authorized to access this application",
            message: "An Email is required as part of the header"
        }));
    };
    else
       {
         //do something
       }
    };

Here is my GET request simulation (by Advanced REST client - chrome extension):

enter image description here

As you can see, I get 403 because req.params is undefined.

My question: How can I add params to the header? it's look like the email I insert to the header is not working.

I am not sure what your token param is since you are not sending it in your request. But if you want to get the email in the request header you should use req.headers instead of req.params, like this:

if (!req.headers.email) {
    res.writeHead(403, {
        'Content-Type': 'application/json; charset=utf-8'
    });
    res.end(JSON.stringify({
        error: "You are not authorized to access this application",
        message: "An Email is required as part of the header"
    }));
}