app: make _healthz a real API route, match on k8s healthcheck user-agent

Signed-off-by: Xe Iaso <me@xeiaso.net>

app/_healthz/route.ts

@@ -0,0 +1,14 @@
+import { NextRequest, NextResponse } from "next/server";
+
+export const GET = async (req: NextRequest) => {
+  if (req.headers.get("user-agent") !== "healthz") {
+    return NextResponse.json({ error: "Not found" }, { status: 404 });
+  }
+
+  return new Response("OK", {
+    status: 200,
+    headers: {
+      "Content-Type": "text/plain",
+    },
+  });
+};

manifest/deployment.yaml

@@ -47,9 +47,7 @@ spec:
               path: /_healthz
               port: 3000
               httpHeaders:
-                - name: x-real-ip
-                  value: "100.100.100.100"
                 - name: user-agent
-                  value: "Kubernetes healthchecks"
+                  value: "healthz"
             initialDelaySeconds: 3
             periodSeconds: 3

public/_healthz

@@ -1 +0,0 @@
-OK