2.7.0版本getContextPath方法：
```
protected String getContextPath(URL url) {
        String contextPath = url.getPath();
        return contextPath.endsWith("/") ? contextPath.substring(0,contextPath.length()-1) : contextPath;
    }
```
无法将方法置入web容器中，退回2.6.5版本的方法：
```
protected String getContextPath(URL url) {
        int pos = url.getPath().lastIndexOf("/");
        return pos > 0 ? url.getPath().substring(0, pos) : "";
    }
```
使用正常，两个方法应该不等价的。
private Protocol protocolDelegate = Mockito.mock(Protocol.class);
    private Registry registryDelegate = Mockito.mock(Registry.class);
    private Exporter exporter = Mockito.mock(Exporter.class);
    private ServiceConfig<DemoServiceImpl> service = new ServiceConfig<DemoServiceImpl>();
    private ServiceConfig<DemoServiceImpl> service2 = new ServiceConfig<DemoServiceImpl>();
    private ServiceConfig<DemoServiceImpl> delayService = new ServiceConfig<DemoServiceImpl>();
    @BeforeEach
    public void setUp() throws Exception {
        MockProtocol2.delegate = protocolDelegate;
        MockRegistryFactory2.registry = registryDelegate;
        Mockito.when(protocolDelegate.export(Mockito.any(Invoker.class))).thenReturn(exporter);
        ApplicationConfig app = new ApplicationConfig("app");
        ProtocolConfig protocolConfig = new ProtocolConfig();
        protocolConfig.setName("mockprotocol2");
        ProviderConfig provider = new ProviderConfig();
        provider.setExport(true);
        provider.setProtocol(protocolConfig);
        RegistryConfig registry = new RegistryConfig();
        registry.setProtocol("mockprotocol2");
        registry.setAddress("N/A");