public static boolean isTracerKey(String key) {
        return key.startsWith(PREFIX);
    }
@Test
    public void isTracerKey() {
        Assert.assertTrue(HttpTracerUtils.isTracerKey(RemotingConstants.RPC_TRACE_NAME + ".xx"));
        Assert.assertFalse(HttpTracerUtils.isTracerKey("rpc_trace_context111.xx"));
    }