From df80493dd9edf0d7727677a12b23a3def5809925 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=81ukasz=20Mierzwa?= <l.mierzwa@gmail.com>
Date: Fri, 14 Aug 2026 11:39:59 +0100
Subject: [PATCH] fix(backend): redirect index.html to /

Fixes #7069
---
 CHANGELOG.md            |  6 ++++++
 cmd/karma/assets.go     |  5 +++++
 cmd/karma/main.go       |  3 +++
 cmd/karma/views_test.go | 12 ++++++++++++
 4 files changed, 26 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3fc74110f..73c43c22f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## v0.133
+
+### Changed
+
+- Requests for `/index.html` will now be redirected to `/` - #7069.
+
 ## v0.132
 
 ### Changed
diff --git a/cmd/karma/assets.go b/cmd/karma/assets.go
index 7dbde412d..3fd090149 100644
--- a/cmd/karma/assets.go
+++ b/cmd/karma/assets.go
@@ -45,6 +45,11 @@ func serverStaticFiles(prefix, root string) func(next http.Handler) http.Handler
 			fixedPath := strings.TrimPrefix(r.URL.Path, prefix)
 			filePath := strings.TrimSuffix(root, "/") + "/" + strings.TrimPrefix(fixedPath, "/")
 
+			if filepath.Base(filePath) == "index.html" {
+				next.ServeHTTP(w, r)
+				return
+			}
+
 			slog.Debug(
 				"Static file request",
 				slog.String("path", r.URL.Path),
diff --git a/cmd/karma/main.go b/cmd/karma/main.go
index b100f97e3..364e54693 100644
--- a/cmd/karma/main.go
+++ b/cmd/karma/main.go
@@ -143,6 +143,9 @@ func setupRouter(router *chi.Mux, historyPoller *historyPoller) {
 	if config.Config.Listen.Prefix != "/" {
 		router.Get(getViewURL(""), redirectIndex)
 	}
+	router.Get(getViewURL("/index.html"), func(w http.ResponseWriter, r *http.Request) {
+		http.Redirect(w, r, getViewURL("/"), http.StatusMovedPermanently)
+	})
 	router.Get(getViewURL("/"), index)
 	router.Get(getViewURL("/version"), versionHandler)
 	router.Get(getViewURL("/health"), pong)
diff --git a/cmd/karma/views_test.go b/cmd/karma/views_test.go
index 1ac6f1cc1..70131c97a 100644
--- a/cmd/karma/views_test.go
+++ b/cmd/karma/views_test.go
@@ -137,6 +137,18 @@ func TestIndex(t *testing.T) {
 			request: "/",
 			status:  200,
 		},
+		{
+			prefix:   "",
+			request:  "/index.html",
+			redirect: "/",
+			status:   301,
+		},
+		{
+			prefix:   "/prefix",
+			request:  "/prefix/index.html",
+			redirect: "/prefix/",
+			status:   301,
+		},
 		{
 			prefix:  "",
 			request: "/alertList.json",