diff --git a/client.go b/client.go
index 305394c..02e94b5 100644
--- a/client.go
+++ b/client.go
@@ -74,6 +74,9 @@ func (c *Client) do(req *http.Request) (*http.Response, error) {
 		hook.BeforeRequest(req)
 	}
 	resp, err := c.Client.Do(req)
+	if err != nil {
+		err = NetworkErr{error: err}
+	}
 	for _, hook := range c.HttpHooks {
 		hook.AfterRequest(resp, err)
 	}
diff --git a/items.go b/items.go
index e977a9e..9e26f39 100644
--- a/items.go
+++ b/items.go
@@ -240,3 +240,14 @@ type PushLoginResponse struct {
 func (p PushLoginResponse) Ok() bool {
 	return p.Ret == "0" && p.UUID != ""
 }
+
+type NetworkErr struct{ error }
+
+func (n NetworkErr) Unwrap() error {
+	return n.error
+}
+
+func IsNetworkError(err error) bool {
+	_, ok := err.(NetworkErr)
+	return ok
+}