From 791e4c9f7a079d2916514acabbcdc385f96688a9 Mon Sep 17 00:00:00 2001
From: Pavel Punsky <eakraly@users.noreply.github.com>
Date: Sun, 30 Mar 2025 12:58:41 -0700
Subject: [PATCH] Add Content-Type header to prometheus response (#1662)

Prometheus v3 requires `Content-Type` header
Fixes #1658
---
 src/apps/relay/prom_server.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/apps/relay/prom_server.c b/src/apps/relay/prom_server.c
index f4bfb56..9630cbc 100644
--- a/src/apps/relay/prom_server.c
+++ b/src/apps/relay/prom_server.c
@@ -65,6 +65,7 @@ MHD_RESULT promhttp_handler(void *cls, struct MHD_Connection *connection, const
     }
     ret = MHD_NO;
   } else {
+    MHD_add_response_header(response, "Content-Type", "text/plain");
     ret = MHD_queue_response(connection, status, response);
     MHD_destroy_response(response);
   }