feat(http): make trailing-slash redirect configurable

backend/plugins/drivers/driver_http/engine_slash_test.go

@@ -0,0 +1,28 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package driver_http
+
+import "testing"
+
+func TestBuildEngineDefaultRedirectsTrailingSlash(t *testing.T) {
+	eng, err := BuildEngineWithConfig(httpAppConfig{}, httpRedisConfig{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !eng.RedirectTrailingSlash {
+		t.Fatal("default RedirectTrailingSlash must be true")
+	}
+}
+
+func TestBuildEngineCanDisableRedirectTrailingSlash(t *testing.T) {
+	eng, err := BuildEngineWithConfig(httpAppConfig{RedirectTrailingSlash: boolPtr(false)}, httpRedisConfig{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if eng.RedirectTrailingSlash {
+		t.Fatal("RedirectTrailingSlash must honor false")
+	}
+}
+
+func boolPtr(v bool) *bool { return &v }