Ok, thanks for this advice. 
So, should we include requested URI only if the strategy's redirect attribute is specified as a route (and not as a URI, because in that case we have to use URI concatenation) ?
```
if (null === $url) {
    $urlParams = array();
    if ($this->includeRequestedUri && $routeMatch->getMatchedRouteName()) {
        $requestedUri = $router->assemble($routeMatch->getParams(), array('name' => $routeMatch->getMatchedRouteName()));
        $urlParams = array('redirect' => urlencode($requestedUri));
    }
    $url = $router->assemble($urlParams, array('name' => $this->redirectRoute));
}
```
And it requires a 'redirect' param to be authorized in the login route (`'zfcuser/login'`).