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。
return new java.net.URL(toString());
        } catch (MalformedURLException e) {
            throw new IllegalStateException(e.getMessage(), e);
        }
    }
    public InetSocketAddress toInetSocketAddress() {
        return new InetSocketAddress(host, port);
    }
    /**
     * The format is '{group}/{interfaceName/path}*{version}'
     *
     * @return
     */
    public String getEncodedServiceKey() {
        String serviceKey = this.getServiceKey();
        serviceKey = serviceKey.replaceFirst("/", "*");
        return serviceKey;
    }
    public String getServiceKey() {
        String inf = getServiceInterface();
        if (inf == null) {
            return null;
        }
        StringBuilder buf = new StringBuilder();
        String group = getParameter(Constants.GROUP_KEY);
        if (group != null && group.length() > 0) {
            buf.append(group).append("/");
        }
        buf.append(inf);
        String version = getParameter(Constants.VERSION_KEY);