1. non-simplify mode:
```
dubbo://120.0.0.1:20880/org.apache.dubbo.demo.DemoService?key=value
```
the store path of ZK will be: `/dubbo/porg.apache.dubbo.demo.DemoService/url`

2. simplify mode:
```
dubbo://120.0.0.1:20880/org.apache.dubbo.demo.DemoService?key=value
```
the store path of ZK will be: `/dubbo/porg.apache.dubbo.demo.DemoService/url`

3. simplify mode with path specified:
```
dubbo://120.0.0.1:20880/path-value?key=value
```
the store path of ZK will be: `/dubbo/path-value/url`
return new URL(protocol, username, password, host, port, path, getParameters());
    }
    public String getAuthority() {
        if (StringUtils.isEmpty(username)
                && StringUtils.isEmpty(password)) {
            return null;
        }
        return (username == null ? "" : username)
                + ":" + (password == null ? "" : password);
    }
    public String getHost() {
        return host;
    }
    public URL setHost(String host) {
        return new URL(protocol, username, password, host, port, path, getParameters());
    }
    /**
     * Fetch IP address for this URL.
     * <p>
     * Pls. note that IP should be used instead of Host when to compare with socket's address or to search in a map
     * which use address as its key.
     *
     * @return ip in string format
     */
    public String getIp() {
        if (ip == null) {
            ip = NetUtils.getIpByHost(host);
        }
        return ip;
    }