code: @Test public void testFilterLocalHost() throws Exception {
    assertNull(NetUtils.filterLocalHost(null));
    assertEquals(NetUtils.filterLocalHost(""),"");
    String host=NetUtils.filterLocalHost("dubbo://127.0.0.1:8080/foo");
    assertThat(host,equalTo("dubbo://" + NetUtils.getLocalHost() + ":8080/foo"));
    host=NetUtils.filterLocalHost("127.0.0.1:8080");
    assertThat(host,equalTo(NetUtils.getLocalHost() + ":8080"));
    host=NetUtils.filterLocalHost("0.0.0.0");
    assertThat(host,equalTo(NetUtils.getLocalHost()));
    host=NetUtils.filterLocalHost("88.88.88.88");
    assertThat(host,equalTo(host));
  }
  