Success/failure url middleware functionality

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URL middleware functionality

There is work, documentation and examples in a few internal prototypes (iv and 2fa) that offers the following functionality:

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Middleware

### url and failUrl query parameters

You can use the url middleware to add a url sent to the app via the query parameter url to a cookie.
Typically you would call req.getUrl() to redirect to the site after the user has been through a specific journey.

You can use the url middleware to add a failUrl sent to the app via the query parameter failUrl to a cookie.
Typically you would call req.getFailUrl() to redirect to the site after the user has failed on a journey.

An example can be seen if you go to the following page, enter a url and the press the submit button:

http://localhost:3000/redirect?url=http://www.success-url.com&failUrl=http://www.fail-url.com

Success Redirect example

router.post('/redirect', function (req, res) {
    res.redirect(req.getUrl());
});

Failure Redirect example

router.post('/redirect', function (req, res) {
    res.redirect(req.getFailUrl());
});