Symfony router: check for match on different host

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I found myself wanting to check if a given URL path exists on another host of a multi-host Symfony application from within a controller action. The router service, which is the instance of Symfony's routing component used to route requests to actions, has a match() method, but it only accepts the path part of the URL. It also has a matchRequest() method, but that seems to ignore the HTTP_HOST and SERVER_NAME of the passed Request object.

I discovered that the router, during a request, has a RequestContext object, from which it gets the host value for matching routes. The router's context is gettable and the context's host is settable, so it's just a matter of changing the host, then doing the match():

//…
use Symfony\Component\Routing\Exception\ResourceNotFoundException;
class Controller{
	public action(){
		$router = $this->get('router');
		$routerContext = $router->getContext();
		$requestHost = $routerContext->getHost();
		try{
			$routerContext->setHost('other-domain.com');
			$router->match('/foo');
			$haveMatch = true;
		}catch(ResourceNotFoundException $e){
			$haveMatch = false;
		}
		$routerContext->setHost($requestHost);
		//…
	}
}

The $haveMatch boolean can then be used for whatever logic I want. I am setting the host back to what it was just in case, though it didn't seem to cause any problems when I didn't.
</toby>