gistfile1.js

var page = require('webpage').create();
var server = require('webserver').create();

server.listen(12345, function(request, response) {
    if (request.headers['Authorization']) {
        var encAuth = request.headers['Authorization'].substring(6);
        var credentials = atob(encAuth);
        response.statusCode = 200
        response.write('Provided credentials:' + credentials);
        console.log(credentials);
    } else {
        response.statusCode = 401;
        response.setHeader('WWW-Authenticate', 'Basic realm="Basic Auth test"');
        response.write('Authentication Required');
        response.close();
    }
});

page.settings.userName = 'test';
page.settings.password = 'pwd';

page.open('http://localhost:12345', function(status) {
    if (status === 'success') {
        phantom.exit();
    }
});