From 27b962644855cd1c699498e1abbbb0cb07debb55 Mon Sep 17 00:00:00 2001
From: Ana Alexandru-Gabriel <75039938+kickhead13@users.noreply.github.com>
Date: Tue, 22 Jul 2025 15:18:46 +0300
Subject: [PATCH 1/2] updated ngx_http_proxy_module.c to support http_501 in
 proxy_next_upstream

---
 src/http/modules/ngx_http_proxy_module.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 8d5385c1d..2c57e7898 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -260,6 +260,7 @@ static ngx_conf_bitmask_t  ngx_http_proxy_next_upstream_masks[] = {
     { ngx_string("invalid_header"), NGX_HTTP_UPSTREAM_FT_INVALID_HEADER },
     { ngx_string("non_idempotent"), NGX_HTTP_UPSTREAM_FT_NON_IDEMPOTENT },
     { ngx_string("http_500"), NGX_HTTP_UPSTREAM_FT_HTTP_500 },
+    { ngx_string("http_501"), NGX_HTTP_UPSTREAM_FT_HTTP_501 },
     { ngx_string("http_502"), NGX_HTTP_UPSTREAM_FT_HTTP_502 },
     { ngx_string("http_503"), NGX_HTTP_UPSTREAM_FT_HTTP_503 },
     { ngx_string("http_504"), NGX_HTTP_UPSTREAM_FT_HTTP_504 },

From 7dddc4d68347a960ff95c690383d59b3919b9a57 Mon Sep 17 00:00:00 2001
From: Ana Alexandru-Gabriel <75039938+kickhead13@users.noreply.github.com>
Date: Tue, 22 Jul 2025 15:22:10 +0300
Subject: [PATCH 2/2] added NGX_HTTP_UPSTEAM_FT_501 in a way to not overlap
 other constants, for ongoing proxy_next_upstream 501 support

---
 src/http/ngx_http_upstream.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/http/ngx_http_upstream.h b/src/http/ngx_http_upstream.h
index f3e9f7979..5e14666ad 100644
--- a/src/http/ngx_http_upstream.h
+++ b/src/http/ngx_http_upstream.h
@@ -21,6 +21,7 @@
 #define NGX_HTTP_UPSTREAM_FT_TIMEOUT         0x00000004
 #define NGX_HTTP_UPSTREAM_FT_INVALID_HEADER  0x00000008
 #define NGX_HTTP_UPSTREAM_FT_HTTP_500        0x00000010
+#define NGX_HTTP_UPSTREAM_FT_HTTP_501        0x00008000
 #define NGX_HTTP_UPSTREAM_FT_HTTP_502        0x00000020
 #define NGX_HTTP_UPSTREAM_FT_HTTP_503        0x00000040
 #define NGX_HTTP_UPSTREAM_FT_HTTP_504        0x00000080
@@ -35,6 +36,7 @@
 #define NGX_HTTP_UPSTREAM_FT_OFF             0x80000000
 
 #define NGX_HTTP_UPSTREAM_FT_STATUS          (NGX_HTTP_UPSTREAM_FT_HTTP_500  \
+                                             |NGX_HTTP_UPSTREAM_FT_HTTP_501  \
                                              |NGX_HTTP_UPSTREAM_FT_HTTP_502  \
                                              |NGX_HTTP_UPSTREAM_FT_HTTP_503  \
                                              |NGX_HTTP_UPSTREAM_FT_HTTP_504  \