void close() {
        executor.shutdownNow();
        try {
            if ( ! executor.awaitTermination(10, TimeUnit.SECONDS))
                log.log(WARNING, "Failed to shut down url download rpc server within timeout");
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }
An RPC server that handles URL download requests.

@author Lester Solbakken
config-proxy/src/main/java/com/yahoo/vespa/config/proxy/filedistribution/UrlDownloadRpcServer.java