ZeroClipboard is adding a GET-parameter with the unix-timestamp when it is requesting the `swf` to bust browser-caches. It requests something like this `http://localhost:8080/plugins/zeroclipboard.swf?131231234`. 

The node server is taking any url and is mapping it directly to a path on the filesystem, but a file named `zeroclipboard.swf?131231234` does not exist, the filename we have to search for on the disk is `zeroclipboard.swf` and therefore the server returns a 404 error. 

So if we are requesting files with a `GET`-Parameter we have to slice it off, or implement another solution that reacts to the `GET`-Parameter - but until now there is no use-case for reacting to `GET`-Parameters.