[PATCH] Upstream: fixed logging level of upstream invalid header errors

[Maxim Dounin]

# HG changeset patch
# User Maxim Dounin <mdounin at mdounin.ru>
# Date 1634321061 -10800
#      Fri Oct 15 21:04:21 2021 +0300
# Node ID 568299e3799dcd9ec361c998935d267a33b17daf
# Parent  01829d1620956241455867fd8ba28ba54eed5aa9
Upstream: fixed logging level of upstream invalid header errors.

In b87b7092cedb (nginx 1.21.1), logging level of "upstream sent invalid
header" errors was accidentally changed to "info".  This change restores
the "error" level, which is a proper logging level for upstream-side
errors.

diff --git a/src/http/modules/ngx_http_fastcgi_module.c b/src/http/modules/ngx_http_fastcgi_module.c
--- a/src/http/modules/ngx_http_fastcgi_module.c
+++ b/src/http/modules/ngx_http_fastcgi_module.c
@@ -2021,7 +2021,7 @@ ngx_http_fastcgi_process_header(ngx_http
 
             /* rc == NGX_HTTP_PARSE_INVALID_HEADER */
 
-            ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
+            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                           "upstream sent invalid header: \"%*s\\x%02xd...\"",
                           r->header_end - r->header_name_start,
                           r->header_name_start, *r->header_end);
diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -2021,7 +2021,7 @@ ngx_http_proxy_process_header(ngx_http_r
 
         /* rc == NGX_HTTP_PARSE_INVALID_HEADER */
 
-        ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
+        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                       "upstream sent invalid header: \"%*s\\x%02xd...\"",
                       r->header_end - r->header_name_start,
                       r->header_name_start, *r->header_end);
diff --git a/src/http/modules/ngx_http_scgi_module.c b/src/http/modules/ngx_http_scgi_module.c
--- a/src/http/modules/ngx_http_scgi_module.c
+++ b/src/http/modules/ngx_http_scgi_module.c
@@ -1142,7 +1142,7 @@ ngx_http_scgi_process_header(ngx_http_re
 
         /* rc == NGX_HTTP_PARSE_INVALID_HEADER */
 
-        ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
+        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                       "upstream sent invalid header: \"%*s\\x%02xd...\"",
                       r->header_end - r->header_name_start,
                       r->header_name_start, *r->header_end);
diff --git a/src/http/modules/ngx_http_uwsgi_module.c b/src/http/modules/ngx_http_uwsgi_module.c
--- a/src/http/modules/ngx_http_uwsgi_module.c
+++ b/src/http/modules/ngx_http_uwsgi_module.c
@@ -1363,7 +1363,7 @@ ngx_http_uwsgi_process_header(ngx_http_r
 
         /* rc == NGX_HTTP_PARSE_INVALID_HEADER */
 
-        ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
+        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                       "upstream sent invalid header: \"%*s\\x%02xd...\"",
                       r->header_end - r->header_name_start,
                       r->header_name_start, *r->header_end);