diff --git a/web/error.go b/web/error.go
new file mode 100644
index 0000000..b7c77bc
--- /dev/null
+++ b/web/error.go
@@ -0,0 +1,17 @@
+package web
+
+func NewWebError(code int, message string) *WebError {
+	return &WebError{
+		Code:    code,
+		Message: message,
+	}
+}
+
+type WebError struct {
+	Code    int
+	Message string
+}
+
+func (e *WebError) Error() string {
+	return e.Message
+}
diff --git a/web/fasthttp/server-handler.go b/web/fasthttp/server-handler.go
index 6f3f4d2..7b17025 100644
--- a/web/fasthttp/server-handler.go
+++ b/web/fasthttp/server-handler.go
@@ -14,7 +14,7 @@ import (
 type ServerHandler interface {
 	web.ServerHandler
 
-	OnError(serverCtx server.ServerCtx, ctx *fasthttp.RequestCtx, status int, reason error)
+	OnError(serverCtx server.ServerCtx, ctx *fasthttp.RequestCtx, err *web.WebError)
 
 	RegisterServlet(path string, servlet Servlet)
 	Servlet(serverCtx server.ServerCtx, ctx *fasthttp.RequestCtx) Servlet
@@ -58,8 +58,8 @@ func (sh *ServerHandlers) Destroy(serverCtx server.ServerCtx) {
 	sh.ServerHandlers.Destroy(serverCtx)
 }
 
-func (sh *ServerHandlers) OnError(serverCtx server.ServerCtx, ctx *fasthttp.RequestCtx, status int, reason error) {
-	ctx.Error(reason.Error(), status)
+func (sh *ServerHandlers) OnError(serverCtx server.ServerCtx, ctx *fasthttp.RequestCtx, err *web.WebError) {
+	ctx.Error(err.Message, err.Code)
 }
 
 func (sh *ServerHandlers) RegisterServlet(contextPath string, servlet Servlet) {
diff --git a/web/fasthttp/server.go b/web/fasthttp/server.go
index d85f4fe..75c207e 100644
--- a/web/fasthttp/server.go
+++ b/web/fasthttp/server.go
@@ -9,6 +9,7 @@ import (
 
 	"git.loafle.net/commons/logging-go"
 	"git.loafle.net/commons/server-go"
+	"git.loafle.net/commons/server-go/web"
 	"github.com/valyala/fasthttp"
 )
 
@@ -138,14 +139,16 @@ func (s *Server) httpHandler(ctx *fasthttp.RequestCtx) {
 	)
 
 	if servlet = s.ServerHandler.Servlet(s.ctx, ctx); nil == servlet {
-		s.onError(ctx, fasthttp.StatusNotFound, fmt.Errorf("Not Found"))
+		s.onError(ctx, web.NewWebError(fasthttp.StatusNotFound, "Not Found"))
 		return
 	}
 	servletCtx := servlet.ServletCtx(s.ctx)
 
-	servlet.Handle(servletCtx, ctx)
+	if err := servlet.Handle(servletCtx, ctx); nil != err {
+		s.onError(ctx, err)
+	}
 }
 
-func (s *Server) onError(ctx *fasthttp.RequestCtx, status int, reason error) {
-	s.ServerHandler.OnError(s.ctx, ctx, status, reason)
+func (s *Server) onError(ctx *fasthttp.RequestCtx, err *web.WebError) {
+	s.ServerHandler.OnError(s.ctx, ctx, err)
 }
diff --git a/web/fasthttp/servlet.go b/web/fasthttp/servlet.go
index 3a9271f..33eb703 100644
--- a/web/fasthttp/servlet.go
+++ b/web/fasthttp/servlet.go
@@ -9,7 +9,7 @@ import (
 type Servlet interface {
 	web.Servlet
 
-	Handle(servletCtx server.ServletCtx, ctx *fasthttp.RequestCtx)
+	Handle(servletCtx server.ServletCtx, ctx *fasthttp.RequestCtx) *web.WebError
 }
 
 type Servlets struct {
@@ -28,6 +28,6 @@ func (s *Servlets) Destroy(serverCtx server.ServerCtx) {
 	//
 }
 
-func (s *Servlets) Handle(servletCtx server.ServletCtx, ctx *fasthttp.RequestCtx) {
-
+func (s *Servlets) Handle(servletCtx server.ServletCtx, ctx *fasthttp.RequestCtx) *web.WebError {
+	return nil
 }