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`
private static void putRandomPort(String protocol, Integer port) {
        protocol = protocol.toLowerCase();
        if (!RANDOM_PORT_MAP.containsKey(protocol)) {
            RANDOM_PORT_MAP.put(protocol, port);
            logger.warn("Use random available port(" + port + ") for protocol " + protocol);
        }
    }
    public URL toUrl() {
        return urls.isEmpty() ? null : urls.iterator().next();
    }
    public List<URL> toUrls() {
        return urls;
    }
    @Parameter(excluded = true)
    public boolean isExported() {
        return exported;
    }
    @Parameter(excluded = true)
    public boolean isUnexported() {
        return unexported;
    }
    public void checkAndUpdateSubConfigs() {
        // 
        completeCompoundConfigs();
        // 
        startConfigCenter();
        checkDefault();
        checkApplication();
        checkRegistry();
        checkProtocol();