If there are some requests you don't want to wait, just set the socket & connection timeout & no retry on error. Restlet 设置连接超时的方法。

restlet-connection-timeout.java

Context ctx = new Context();
ctx.getParameters().add("socketTimeout", "200");  // http.socket.timeout
ctx.getParameters().add("socketConnectTimeoutMs", "100"); // http.connection.timeout
ClientResource client = new ClientResource(uri);
client.setNext(new Client(ctx, Protocol.HTTP));
client.setRetryOnError(false);

Representation entity = client.get();