lower version, for example 2.6.8
```properties
dubbo.provider.version=1.0
```

2.7.6 failed to recognize the provider url with 'default.version=1.0' key,  it only takes 'version.1.0' into consideration.

return this;
        }
        
        if (value.equals(getParameters().get(key))) { 
            return this;
        }
        Map<String, String> map = new HashMap<>(getParameters());
        map.put(key, value);
        return new URL(protocol, username, password, host, port, path, map);
    }
    public URL addParameterIfAbsent(String key, String value) {
        if (StringUtils.isEmpty(key)
                || StringUtils.isEmpty(value)) {
            return this;
        }
        if (hasParameter(key)) {
            return this;
        }
        Map<String, String> map = new HashMap<>(getParameters());
        map.put(key, value);
        return new URL(protocol, username, password, host, port, path, map);
    }
    public URL addMethodParameter(String method, String key, String value) {
        if (StringUtils.isEmpty(method)
                || StringUtils.isEmpty(key)
                || StringUtils.isEmpty(value)) {
            return this;
        }
        Map<String, String> map = new HashMap<>(getParameters());
        map.put(method + "." + key, value);