Impossible to override the redirect URL

[peterbe]

Suppose you have this:

<a href="#" data-next="/" class="browserid-login persona-button dark" >
    <span>Sign in</span>
</a>

And you override login_success or login_failure to do something like this:

return JSONResponse({'redirect': '/some/page'})

Then it will ignore that and instead go to $link.data('next') because this code.