diff --git a/server.go b/server.go
index a0d173c..1ae02c2 100644
--- a/server.go
+++ b/server.go
@@ -1,7 +1,6 @@
 package overflow_gateway_websocket
 
 import (
-	"log"
 	"net/http"
 	"sync"
 
@@ -43,12 +42,11 @@ func NewServer(o *ServerOptions) Server {
 	return s
 }
 
-func (s *server) onPush(cb OnPushFunc) {
-
-}
-
 func (s *server) onError(ctx *fasthttp.RequestCtx, status int, reason error) {
+	ctx.Response.Header.Set("Sec-Websocket-Version", "13")
+	ctx.Error(http.StatusText(status), status)
 
+	s._option.OnError(ctx, status, reason)
 }
 
 func (s *server) onDisconnected(c Client) {
@@ -61,16 +59,13 @@ func (s *server) onConnection(ctx *fasthttp.RequestCtx) {
 	path := string(ctx.Path())
 	co, ok := s._handlers[path]
 	if !ok {
-		ctx.Response.Header.Set("Sec-Websocket-Version", "13")
-		ctx.Error(http.StatusText(fasthttp.StatusNotFound), fasthttp.StatusNotFound)
-
-		log.Printf("Path[%s] is not exist.", path)
+		s.onError(ctx, fasthttp.StatusNotFound, nil)
 		return
 	}
 
 	s._upgrader.Upgrade(ctx, nil, func(conn *websocket.Conn, err error) {
 		if err != nil {
-			log.Print("upgrade:", err)
+			s.onError(ctx, fasthttp.StatusInternalServerError, err)
 			return
 		}
 		s._cMtx.Lock()
diff --git a/server_options.go b/server_options.go
index 3153cd7..8b29372 100644
--- a/server_options.go
+++ b/server_options.go
@@ -10,7 +10,6 @@ import (
 type (
 	OnConnectionFunc   func(c Client)
 	OnDisconnectedFunc func(c Client)
-	OnPushFunc         func()
 )
 
 const (