From 652b604c90eff5ccf794c709bcad9008f4d91987 Mon Sep 17 00:00:00 2001
From: "Alessandro (Ale) Segala" <43508+ItalyPaleAle@users.noreply.github.com>
Date: Mon, 12 Oct 2026 13:57:46 -0700
Subject: [PATCH] Add /healthz endpoint to server (#259)

Co-authored-by: Michael Eischer <michael.eischer@fau.de>
---
 mux.go      |  3 +++
 mux_test.go | 16 ++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/mux.go b/mux.go
index a6962f4..27225f9 100644
--- a/mux.go
+++ b/mux.go
@@ -112,6 +112,9 @@ func NewHandler(server *Server) (http.Handler, error) {
 			mux.HandleFunc("/metrics", server.wrapMetricsAuth(promhttp.Handler().ServeHTTP))
 		}
 	}
+	mux.HandleFunc("/healthz", func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusNoContent)
+	})
 	mux.Handle("/", server)
 
 	var handler http.Handler = mux
diff --git a/mux_test.go b/mux_test.go
index 3558825..52c30f1 100644
--- a/mux_test.go
+++ b/mux_test.go
@@ -80,6 +80,22 @@ func TestCheckAuth(t *testing.T) {
 	}
 }
 
+func TestHealthz(t *testing.T) {
+	handler, err := NewHandler(&Server{NoAuth: true})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	rec := httptest.NewRecorder()
+	handler.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/healthz", nil))
+	if rec.Code != http.StatusNoContent {
+		t.Fatalf("status = %d, want %d", rec.Code, http.StatusNoContent)
+	}
+	if rec.Body.Len() != 0 {
+		t.Fatalf("body = %q, want empty", rec.Body.String())
+	}
+}
+
 func TestUnauthorizedResponsesIncludeBasicChallenge(t *testing.T) {
 	const challenge = `Basic realm="rest-server"`