[Refactor]

1.allow maybe empty group
2.use COMPATIBLE(DIRECT alias) when proxy group is empty
3.http provider pass through tunnel

adapter/provider/provider.go

@@ -67,6 +67,10 @@ func (pp *proxySetProvider) Initial() error {
 	}
 
 	pp.onUpdate(elm)
+	if pp.healthCheck.auto() {
+		go pp.healthCheck.process()
+	}
+
 	return nil
 }
 
@@ -102,10 +106,6 @@ func NewProxySetProvider(name string, interval time.Duration, filter string, veh
 		return nil, fmt.Errorf("invalid filter regex: %w", err)
 	}
 
-	if hc.auto() {
-		go hc.process()
-	}
-
 	pd := &proxySetProvider{
 		proxies:     []C.Proxy{},
 		healthCheck: hc,
@@ -190,6 +190,10 @@ func (cp *compatibleProvider) Update() error {
 }
 
 func (cp *compatibleProvider) Initial() error {
+	if cp.healthCheck.auto() {
+		go cp.healthCheck.process()
+	}
+
 	return nil
 }
 
@@ -219,10 +223,6 @@ func NewCompatibleProvider(name string, proxies []C.Proxy, hc *HealthCheck) (*Co
 		return nil, errors.New("provider need one proxy at least")
 	}
 
-	if hc.auto() {
-		go hc.process()
-	}
-
 	pd := &compatibleProvider{
 		name:        name,
 		proxies:     proxies,