From: Sergey Kandaurov <pluknet@nginx.com>
Date: Wed, 29 Apr 2026 19:02:20 +0000 (+0400)
Subject: Upstream: fixed parsing of split status lines
X-Git-Tag: release-1.30.1~3
X-Git-Url: http://git.kaiwu.me/postgresql/log/contrib/postgres_fdw/static/gitweb.js?a=commitdiff_plain;h=39d7d0ba0799fcff6baee52b6525f45739593cfd;p=nginx.git

Upstream: fixed parsing of split status lines

If the first response line was split across reads and it didn't appear
a status line, the portion already processed was lost.  To preserve ABI,
the change reuses r->header_name_start for proper backtracking on status
line fallback.
---

diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 0b388b30f..276cc0750 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -1752,6 +1752,10 @@ ngx_http_proxy_process_status_line(ngx_http_request_t *r)
 
     u = r->upstream;
 
+    if (r->state == 0) {
+        r->header_name_start = u->buffer.pos;
+    }
+
     rc = ngx_http_parse_status_line(r, &u->buffer, &ctx->status);
 
     if (rc == NGX_AGAIN) {
@@ -1759,6 +1763,7 @@ ngx_http_proxy_process_status_line(ngx_http_request_t *r)
     }
 
     if (rc == NGX_ERROR) {
+        u->buffer.pos = r->header_name_start;
 
 #if (NGX_HTTP_CACHE)
 
diff --git a/src/http/modules/ngx_http_scgi_module.c b/src/http/modules/ngx_http_scgi_module.c
index 290394a1f..b4a73a5a6 100644
--- a/src/http/modules/ngx_http_scgi_module.c
+++ b/src/http/modules/ngx_http_scgi_module.c
@@ -1028,6 +1028,10 @@ ngx_http_scgi_process_status_line(ngx_http_request_t *r)
 
     u = r->upstream;
 
+    if (r->state == 0) {
+        r->header_name_start = u->buffer.pos;
+    }
+
     rc = ngx_http_parse_status_line(r, &u->buffer, status);
 
     if (rc == NGX_AGAIN) {
@@ -1036,6 +1040,7 @@ ngx_http_scgi_process_status_line(ngx_http_request_t *r)
 
     if (rc == NGX_ERROR) {
         u->process_header = ngx_http_scgi_process_header;
+        u->buffer.pos = r->header_name_start;
         r->state = 0;
         return ngx_http_scgi_process_header(r);
     }
diff --git a/src/http/modules/ngx_http_uwsgi_module.c b/src/http/modules/ngx_http_uwsgi_module.c
index 4140b1b40..ecd6dd0d7 100644
--- a/src/http/modules/ngx_http_uwsgi_module.c
+++ b/src/http/modules/ngx_http_uwsgi_module.c
@@ -1267,6 +1267,10 @@ ngx_http_uwsgi_process_status_line(ngx_http_request_t *r)
 
     u = r->upstream;
 
+    if (r->state == 0) {
+        r->header_name_start = u->buffer.pos;
+    }
+
     rc = ngx_http_parse_status_line(r, &u->buffer, status);
 
     if (rc == NGX_AGAIN) {
@@ -1275,6 +1279,7 @@ ngx_http_uwsgi_process_status_line(ngx_http_request_t *r)
 
     if (rc == NGX_ERROR) {
         u->process_header = ngx_http_uwsgi_process_header;
+        u->buffer.pos = r->header_name_start;
         r->state = 0;
         return ngx_http_uwsgi_process_header(r);
     }