diff --git a/server/internal/httpapi/server.go b/server/internal/httpapi/server.go
index 5a7a712..01dd183 100644
--- a/server/internal/httpapi/server.go
+++ b/server/internal/httpapi/server.go
@@ -1148,7 +1148,7 @@ func (a *App) proxyLuCI(w http.ResponseWriter, r *http.Request, deviceID, sessio
 		}
 		rewriteLuCIHeaders(resp.Header, prefix)
 		contentType := resp.Header.Get("Content-Type")
-		if !strings.Contains(contentType, "text/html") && !strings.Contains(contentType, "javascript") && !strings.Contains(contentType, "text/css") {
+		if !strings.Contains(contentType, "text/html") {
 			return nil
 		}
 		body, err := io.ReadAll(resp.Body)
diff --git a/server/internal/httpapi/server_test.go b/server/internal/httpapi/server_test.go
index 8464cbc..15e012b 100644
--- a/server/internal/httpapi/server_test.go
+++ b/server/internal/httpapi/server_test.go
@@ -425,6 +425,11 @@ func TestLuCIProxyRequiresActiveSessionAndRewritesPaths(t *testing.T) {
 			t.Fatal("LuCI route cookie leaked to LuCI upstream")
 		}
 		upstreamPath = r.URL.Path
+		if r.URL.Path == "/luci-static/resources/luci.js" {
+			w.Header().Set("Content-Type", "application/javascript")
+			_, _ = io.WriteString(w, `const untouched = '/cgi-bin/luci';`)
+			return
+		}
 		w.Header().Set("Content-Type", "text/html")
 		_, _ = io.WriteString(w, `<a href="/cgi-bin/luci/admin">LuCI</a><link href="/luci-static/test.css"><script>L = new LuCI({ "resource": "\/luci-static\/resources", "scriptname": "\/cgi-bin\/luci", "ubuspath": "\/ubus\/" });</script>`)
 	}))
@@ -510,6 +515,10 @@ func TestLuCIProxyRequiresActiveSessionAndRewritesPaths(t *testing.T) {
 	if upstreamPath != "/cgi-bin/luci/admin" {
 		t.Fatalf("LuCI fallback used upstream path %q", upstreamPath)
 	}
+	script := requestText(t, http.MethodGet, srv.URL+prefix+"/luci-static/resources/luci.js", "operator-test", nil, http.StatusOK)
+	if script != `const untouched = '/cgi-bin/luci';` {
+		t.Fatalf("LuCI JavaScript was unexpectedly rewritten: %s", script)
+	}
 }
 
 func TestServesStaticWebUI(t *testing.T) {