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。
Map<String, String> params = new HashMap<String, String>();
        params.put("p1", "v1");
        params.put("p2", "v2");
        assertEquals(params, url.getParameters());
        url = URL.valueOf("file:/home/user1/router.js?p1=v1&p2=v2");
        assertEquals("file", url.getProtocol());
        assertNull(url.getUsername());
        assertNull(url.getPassword());
        assertNull(url.getHost());
        assertEquals(0, url.getPort());
        assertEquals("home/user1/router.js", url.getPath());
        assertEquals(2, url.getParameters().size());
        params = new HashMap<String, String>();
        params.put("p1", "v1");
        params.put("p2", "v2");
        assertEquals(params, url.getParameters());
    }
    @Test
    public void test_valueOf_WithProtocolHost() throws Exception {
        URL url = URL.valueOf("dubbo://10.20.130.230");
        assertEquals("dubbo", url.getProtocol());
        assertNull(url.getUsername());
        assertNull(url.getPassword());
        assertEquals("10.20.130.230", url.getHost());
        assertEquals(0, url.getPort());
        assertEquals(null, url.getPath());
        assertEquals(0, url.getParameters().size());
        url = URL.valueOf("dubbo://10.20.130.230:20880/context/path");
        assertEquals("dubbo", url.getProtocol());
        assertNull(url.getUsername());