https://github.com/go-chassis/go-sc-client/blob/a098d7856af723af79d18399e8956b9f11ab53b8/client.go#L265

return exsist
but in ServiceCenter, may be param error and so on

https://github.com/apache/servicecomb-service-center/blob/6285f2bb9cb4b6ad7195dfaf931bfb0ba89561de/server/rest/controller/v4/microservice_controller.go#L61

https://github.com/go-chassis/sc-client/blob/master/client_test.go#L263
TestClient_Auth单测会因为这一行的if语句直接退出，走不到下面的逻辑
我注释掉之后，会在调用GetToken方法的时候报一个404的错误码

https://github.com/go-chassis/go-sc-client/blob/a098d7856af723af79d18399e8956b9f11ab53b8/client.go#L17

Race conditions occur when using multiple clients at the same time, because clients use global variables and are not locked.

https://github.com/go-chassis/sc-client/blob/master/client.go#L163
https://github.com/go-chassis/sc-client/blob/master/client.go#L590

github.com/ServiceComb/go-chassis/core/router/router.go:87

// FitRate fit rate
func FitRate(tags []*model.RouteTag, dest string) *model.RouteTag {
if tags[0].Weight == 100 {
return tags[0]
}

pool, ok := wp.GetPool().Get(dest)
if !ok {
	// first request route to tags[0]
	wp.GetPool().Set(dest, wp.NewPool(tags...))
	return tags[0]
}
return pool.PickOne()

}
以上逻辑会在第一次请求初始化权重池，初始化之后一直缓存，之后更新策略也不会重置，导致更新后权重策略无法生效

【问题】：当使用websocket来建立心跳时，开启协程进行conn.ReadMessage()时，可能会因为cpu使用过高导致断连，需要增加重试机制

如下代码：每次调用c.Health接口后都将SC的c.Config.Addresses的换成最新的SC的地址。
但初始的Addresses会被替换掉，如果一开始使用ClusterIp或域名，
则如果SC的Pod重建则，则所有Addresses的IP都将是无效IP，
以后这个服务就再也不能链上SC了。
// SyncEndpoints gets the endpoints of service-center in the cluster
func (c *RegistryClient) SyncEndpoints() error {
instances, err := c.Health()
if err != nil {
return fmt.Errorf("sync SC ep failed.err:%s", err.Error())
}
eps := []string{}
for _, instance := range instances {
m := getProtocolMap(instance.Endpoints)
eps = append(eps, m["rest"])
}
if len(eps) != 0 {
c.Config.Addresses = eps
lager.Logger.Info("Sync service center endpoints " + strings.Join(eps, ","))
return nil
}
return fmt.Errorf("sync endpoints failed")
}

https://github.com/go-chassis/go-sc-client/blob/78ad13b4fbefd3795c144c02edc9755283d18752/client.go#L204

【question】The WSHeartbeat function lacks the function of re-registration without instance